diff --git a/fml/thread_local.cc b/fml/thread_local.cc
index 862a34331d2f9..88f1407d9b0a9 100644
--- a/fml/thread_local.cc
+++ b/fml/thread_local.cc
@@ -3,39 +3,3 @@
 // found in the LICENSE file.
 
 #include "flutter/fml/thread_local.h"
-
-#if FML_THREAD_LOCAL_PTHREADS
-
-#include <cstring>
-
-#include "flutter/fml/logging.h"
-
-namespace fml {
-namespace internal {
-
-ThreadLocalPointer::ThreadLocalPointer(void (*destroy)(void*)) {
-  FML_CHECK(pthread_key_create(&key_, destroy) == 0);
-}
-
-ThreadLocalPointer::~ThreadLocalPointer() {
-  FML_CHECK(pthread_key_delete(key_) == 0);
-}
-
-void* ThreadLocalPointer::get() const {
-  return pthread_getspecific(key_);
-}
-
-void* ThreadLocalPointer::swap(void* ptr) {
-  void* old_ptr = get();
-  int err = pthread_setspecific(key_, ptr);
-  if (err) {
-    FML_CHECK(false) << "pthread_setspecific failed (" << err
-                     << "): " << strerror(err);
-  }
-  return old_ptr;
-}
-
-}  // namespace internal
-}  // namespace fml
-
-#endif  // FML_THREAD_LOCAL_PTHREADS
diff --git a/fml/thread_local.h b/fml/thread_local.h
index 010c0ff643dd3..1aa62fe0a83e8 100644
--- a/fml/thread_local.h
+++ b/fml/thread_local.h
@@ -10,63 +10,25 @@
 #include "flutter/fml/build_config.h"
 #include "flutter/fml/macros.h"
 
-#define FML_THREAD_LOCAL_PTHREADS \
-  FML_OS_MACOSX || FML_OS_LINUX || FML_OS_ANDROID
-
-#if FML_THREAD_LOCAL_PTHREADS
-#include <pthread.h>
-#endif
-
 namespace fml {
 
-#if FML_THREAD_LOCAL_PTHREADS
-
-#define FML_THREAD_LOCAL static
-
-namespace internal {
-
-class ThreadLocalPointer {
- public:
-  explicit ThreadLocalPointer(void (*destroy)(void*));
-  ~ThreadLocalPointer();
-
-  void* get() const;
-  void* swap(void* ptr);
-
- private:
-  pthread_key_t key_;
-
-  FML_DISALLOW_COPY_AND_ASSIGN(ThreadLocalPointer);
-};
-
-}  // namespace internal
-
-template <typename T>
-class ThreadLocalUniquePtr {
- public:
-  ThreadLocalUniquePtr() : ptr_(destroy) {}
-
-  T* get() const { return reinterpret_cast<T*>(ptr_.get()); }
-  void reset(T* ptr) { destroy(ptr_.swap(ptr)); }
-
- private:
-  static void destroy(void* ptr) { delete reinterpret_cast<T*>(ptr); }
-
-  internal::ThreadLocalPointer ptr_;
-
-  FML_DISALLOW_COPY_AND_ASSIGN(ThreadLocalUniquePtr);
-};
-
-#else  // FML_THREAD_LOCAL_PTHREADS
-
 #define FML_THREAD_LOCAL static thread_local
 
+//------------------------------------------------------------------------------
+/// @brief      A wrapper for a thread-local unique pointer. Do NOT use this
+///             class in new code and instead use unique pointers with the
+///             thread_local storage class directly. This was necessary for
+///             pre-C++11 code.
+///
+/// @tparam     T     The type held in the thread local unique pointer.
+///
 template <typename T>
 class ThreadLocalUniquePtr {
  public:
   ThreadLocalUniquePtr() = default;
 
   T* get() const { return ptr_.get(); }
+
   void reset(T* ptr) { ptr_.reset(ptr); }
 
  private:
@@ -75,14 +37,6 @@ class ThreadLocalUniquePtr {
   FML_DISALLOW_COPY_AND_ASSIGN(ThreadLocalUniquePtr);
 };
 
-#endif  // FML_THREAD_LOCAL_PTHREADS
-
-#ifndef FML_THREAD_LOCAL
-
-#error Thread local storage unavailable on the platform.
-
-#endif  // FML_THREAD_LOCAL
-
 }  // namespace fml
 
 #endif  // FLUTTER_FML_THREAD_LOCAL_H_