[Android] Night mode was modularized

The only reason we used BravePreferenceFragment is to have a close button in the
settings. This will be re-done in the context of this issue brave/brave-browser#10375

Chromium change:
https://chromium.googlesource.com/chromium/src.git/+/b8f8625d98d573809cf06674f733ae31e6276eec

Android: Modularize c.b.night_mode

Moves c.b.night_mode files to a new moduarlized target chrome/browser/
ui/android/night_mode. This helps modularize other packages that
depend on static utils such as NightModeUtils.

Bug: 1171512

android/java/org/chromium/chrome/browser/night_mode/settings/BraveRadioButtonGroupThemePreference.java

@@ -12,7 +12,7 @@
 
 import androidx.preference.PreferenceViewHolder;
 
-import org.chromium.chrome.R;
+import org.chromium.chrome.browser.night_mode.R;
 
 public class BraveRadioButtonGroupThemePreference extends RadioButtonGroupThemePreference {
     public BraveRadioButtonGroupThemePreference(Context context, AttributeSet attrs) {

android/java/org/chromium/chrome/browser/settings/themes/BraveRadioButtonGroupCustomHomepageThemePreference.java

@@ -6,19 +6,20 @@
 package org.chromium.chrome.browser.settings.themes;
 
 import android.content.Context;
-import androidx.preference.PreferenceViewHolder;
 import android.util.AttributeSet;
 import android.view.View;
 import android.widget.RadioGroup;
 
-import org.chromium.chrome.R;
-import org.chromium.components.browser_ui.widget.RadioButtonWithDescription;
-import org.chromium.chrome.browser.profiles.Profile;
-import org.chromium.chrome.browser.preferences.BravePref;
-import org.chromium.components.user_prefs.UserPrefs;
+import androidx.preference.PreferenceViewHolder;
+
+import org.chromium.chrome.browser.BraveRelaunchUtils;
+import org.chromium.chrome.browser.night_mode.R;
 import org.chromium.chrome.browser.night_mode.settings.RadioButtonGroupThemePreference;
 import org.chromium.chrome.browser.ntp_background_images.NTPBackgroundImagesBridge;
-import org.chromium.chrome.browser.BraveRelaunchUtils;
+import org.chromium.chrome.browser.preferences.BravePref;
+import org.chromium.chrome.browser.profiles.Profile;
+import org.chromium.components.browser_ui.widget.RadioButtonWithDescription;
+import org.chromium.components.user_prefs.UserPrefs;
 
 public class BraveRadioButtonGroupCustomHomepageThemePreference extends RadioButtonGroupThemePreference {
 
@@ -50,7 +51,8 @@ public void onBindViewHolder(PreferenceViewHolder holder) {
                 braveDefaultView.setChecked(true);
             }
         }
-        braveDefaultView.setPrimaryText(getContext().getResources().getString(R.string.brave_default));
+        braveDefaultView.setPrimaryText(
+                getContext().getResources().getString(org.chromium.chrome.R.string.brave_default));
     }
 
     @Override