diff --git a/ui/base/ime/input_method_auralinux.cc b/ui/base/ime/input_method_auralinux.cc
index ca9931f06f777..0b65ec31dc51b 100644
--- a/ui/base/ime/input_method_auralinux.cc
+++ b/ui/base/ime/input_method_auralinux.cc
@@ -45,7 +45,6 @@ bool InputMethodAuraLinux::OnUntranslatedIMEMessage(
 
 void InputMethodAuraLinux::DispatchKeyEvent(ui::KeyEvent* event) {
   DCHECK(event->type() == ET_KEY_PRESSED || event->type() == ET_KEY_RELEASED);
-  DCHECK(system_toplevel_window_focused());
 
   // If no text input client, do nothing.
   if (!GetTextInputClient()) {
diff --git a/ui/base/ime/input_method_base.cc b/ui/base/ime/input_method_base.cc
index 3441f928b90ac..df0cb118e5352 100644
--- a/ui/base/ime/input_method_base.cc
+++ b/ui/base/ime/input_method_base.cc
@@ -16,8 +16,7 @@ namespace ui {
 
 InputMethodBase::InputMethodBase()
   : delegate_(NULL),
-    text_input_client_(NULL),
-    system_toplevel_window_focused_(false) {
+    text_input_client_(NULL) {
 }
 
 InputMethodBase::~InputMethodBase() {
@@ -30,13 +29,9 @@ void InputMethodBase::SetDelegate(internal::InputMethodDelegate* delegate) {
   delegate_ = delegate;
 }
 
-void InputMethodBase::OnFocus() {
-  system_toplevel_window_focused_ = true;
-}
+void InputMethodBase::OnFocus() {}
 
-void InputMethodBase::OnBlur() {
-  system_toplevel_window_focused_ = false;
-}
+void InputMethodBase::OnBlur() {}
 
 void InputMethodBase::SetFocusedTextInputClient(TextInputClient* client) {
   SetFocusedTextInputClientInternal(client);
@@ -49,7 +44,7 @@ void InputMethodBase::DetachTextInputClient(TextInputClient* client) {
 }
 
 TextInputClient* InputMethodBase::GetTextInputClient() const {
-  return system_toplevel_window_focused_ ? text_input_client_ : NULL;
+  return text_input_client_;
 }
 
 void InputMethodBase::OnTextInputTypeChanged(const TextInputClient* client) {
diff --git a/ui/base/ime/input_method_base.h b/ui/base/ime/input_method_base.h
index e9efb3a29b9fe..e33461138f7a8 100644
--- a/ui/base/ime/input_method_base.h
+++ b/ui/base/ime/input_method_base.h
@@ -34,9 +34,6 @@ class UI_BASE_IME_EXPORT InputMethodBase
 
   // Overriden from InputMethod.
   void SetDelegate(internal::InputMethodDelegate* delegate) override;
-  // If a derived class overrides OnFocus()/OnBlur(), it should call parent's
-  // implementation first, to make sure |system_toplevel_window_focused_| flag
-  // can be updated correctly.
   void OnFocus() override;
   void OnBlur() override;
   void SetFocusedTextInputClient(TextInputClient* client) override;
@@ -87,10 +84,6 @@ class UI_BASE_IME_EXPORT InputMethodBase
   // |client| which is the text input client with focus.
   void NotifyTextInputCaretBoundsChanged(const TextInputClient* client);
 
-  bool system_toplevel_window_focused() const {
-    return system_toplevel_window_focused_;
-  }
-
  private:
   void SetFocusedTextInputClientInternal(TextInputClient* client);
 
@@ -99,8 +92,6 @@ class UI_BASE_IME_EXPORT InputMethodBase
 
   base::ObserverList<InputMethodObserver> observer_list_;
 
-  bool system_toplevel_window_focused_;
-
   DISALLOW_COPY_AND_ASSIGN(InputMethodBase);
 };
 
diff --git a/ui/base/ime/input_method_chromeos.cc b/ui/base/ime/input_method_chromeos.cc
index 8062a3c6d8c53..59077b451f004 100644
--- a/ui/base/ime/input_method_chromeos.cc
+++ b/ui/base/ime/input_method_chromeos.cc
@@ -98,7 +98,6 @@ void InputMethodChromeOS::ProcessKeyEventDone(ui::KeyEvent* event,
 void InputMethodChromeOS::DispatchKeyEvent(ui::KeyEvent* event) {
   DCHECK(event->IsKeyEvent());
   DCHECK(!(event->flags() & ui::EF_IS_SYNTHESIZED));
-  DCHECK(system_toplevel_window_focused());
 
   // For linux_chromeos, the ime keyboard cannot track the caps lock state by
   // itself, so need to call SetCapsLockEnabled() method to reflect the caps
@@ -301,8 +300,6 @@ void InputMethodChromeOS::ResetContext() {
   if (!IsNonPasswordInputFieldFocused() || !GetTextInputClient())
     return;
 
-  DCHECK(system_toplevel_window_focused());
-
   composition_.Clear();
   result_text_.clear();
   composing_text_ = false;
diff --git a/ui/base/ime/input_method_chromeos_unittest.cc b/ui/base/ime/input_method_chromeos_unittest.cc
index 40677ea4db6d0..d60d99ec038bf 100644
--- a/ui/base/ime/input_method_chromeos_unittest.cc
+++ b/ui/base/ime/input_method_chromeos_unittest.cc
@@ -390,32 +390,6 @@ TEST_F(InputMethodChromeOSTest, GetInputTextType_WithoutFocusedClient) {
   EXPECT_EQ(TEXT_INPUT_TYPE_PASSWORD, ime_->GetTextInputType());
 }
 
-TEST_F(InputMethodChromeOSTest, GetInputTextType_WithoutFocusedWindow) {
-  ime_->OnFocus();
-  EXPECT_EQ(TEXT_INPUT_TYPE_NONE, ime_->GetTextInputType());
-  ime_->OnBlur();
-  input_type_ = TEXT_INPUT_TYPE_PASSWORD;
-  ime_->OnTextInputTypeChanged(this);
-  // The OnTextInputTypeChanged() call above should be ignored since the top-
-  // level window which the ime_ is attached to is not currently focused.
-  EXPECT_EQ(TEXT_INPUT_TYPE_NONE, ime_->GetTextInputType());
-
-  ime_->OnFocus();
-  ime_->OnTextInputTypeChanged(this);
-  EXPECT_EQ(TEXT_INPUT_TYPE_PASSWORD, ime_->GetTextInputType());
-}
-
-TEST_F(InputMethodChromeOSTest, GetInputTextType_WithoutFocusedWindow2) {
-  EXPECT_EQ(TEXT_INPUT_TYPE_NONE, ime_->GetTextInputType());
-  input_type_ = TEXT_INPUT_TYPE_PASSWORD;
-  ime_->OnTextInputTypeChanged(this);
-  EXPECT_EQ(TEXT_INPUT_TYPE_NONE, ime_->GetTextInputType());
-
-  ime_->OnFocus();
-  ime_->OnTextInputTypeChanged(this);
-  EXPECT_EQ(TEXT_INPUT_TYPE_PASSWORD, ime_->GetTextInputType());
-}
-
 // Confirm that IBusClient::FocusIn is called on "connected" if input_type_ is
 // TEXT.
 TEST_F(InputMethodChromeOSTest, FocusIn_Text) {
diff --git a/ui/base/ime/input_method_win.cc b/ui/base/ime/input_method_win.cc
index 56bbac1b3244b..6604c6d31bb6a 100644
--- a/ui/base/ime/input_method_win.cc
+++ b/ui/base/ime/input_method_win.cc
@@ -297,15 +297,13 @@ LRESULT InputMethodWin::OnImeSetContext(HWND window_handle,
                                         BOOL* handled) {
   if (!!wparam) {
     imm32_manager_.CreateImeWindow(window_handle);
-    if (system_toplevel_window_focused()) {
-      // Delay initialize the tsf to avoid perf regression.
-      // Loading tsf dll causes some time, so doing it in UpdateIMEState() will
-      // slow down the browser window creation.
-      // See crbug.com/509984.
-      tsf_inputscope::InitializeTsfForInputScopes();
-      tsf_inputscope::SetInputScopeForTsfUnawareWindow(
-          toplevel_window_handle_, GetTextInputType(), GetTextInputMode());
-    }
+    // Delay initialize the tsf to avoid perf regression.
+    // Loading tsf dll causes some time, so doing it in UpdateIMEState() will
+    // slow down the browser window creation.
+    // See crbug.com/509984.
+    tsf_inputscope::InitializeTsfForInputScopes();
+    tsf_inputscope::SetInputScopeForTsfUnawareWindow(
+        toplevel_window_handle_, GetTextInputType(), GetTextInputMode());
   }
 
   OnInputMethodChanged();