[WebView] Remove more redundant classes

android_webview/browser/aw_locale_manager.h

Index: android_webview/browser/aw_locale_manager.h
diff --git a/android_webview/browser/aw_locale_manager.h b/android_webview/browser/aw_locale_manager.h
index 899629c66794ecfd02a8d55b03cd683b02ab1f1b..36a0051d958c5a79f808c1f873ddcb1ab7547b83 100644
--- a/android_webview/browser/aw_locale_manager.h
+++ b/android_webview/browser/aw_locale_manager.h
@@ -11,15 +11,14 @@
 
 namespace android_webview {
 
-// Empty base class so this can be destroyed by AwContentBrowserClient.
 class AwLocaleManager {
  public:
-  AwLocaleManager() {}
-  virtual ~AwLocaleManager() {}
+  AwLocaleManager() = default;
+  ~AwLocaleManager() = default;
 
-  virtual std::string GetLocale() = 0;
+  std::string GetLocale();
 
-  virtual std::string GetLocaleList() = 0;
+  std::string GetLocaleList();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AwLocaleManager);