[WebView] Remove more redundant classes

android_webview/browser/aw_locale_manager.h

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef ANDROID_WEBVIEW_BROWSER_AW_LOCALE_MANAGER_H_
-#define ANDROID_WEBVIEW_BROWSER_AW_LOCALE_MANAGER_H_
-
-#include <string>
-
-#include "base/macros.h"
-
-namespace android_webview {
-
-// Empty base class so this can be destroyed by AwContentBrowserClient.
-class AwLocaleManager {
- public:
-  AwLocaleManager() {}
-  virtual ~AwLocaleManager() {}
-
-  virtual std::string GetLocale() = 0;
-
-  virtual std::string GetLocaleList() = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(AwLocaleManager);
-};
-
-}  // namespace android_webview
-
-#endif  // ANDROID_WEBVIEW_BROWSER_AW_LOCALE_MANAGER_H_