[WebView] Remove more redundant classes

android_webview/browser/aw_locale_manager_impl.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_IMPL_H_
-#define ANDROID_WEBVIEW_BROWSER_AW_LOCALE_MANAGER_IMPL_H_
-
-#include "android_webview/browser/aw_locale_manager.h"
-
-#include "base/macros.h"
-
-namespace android_webview {
-
-class AwLocaleManagerImpl : public AwLocaleManager {
- public:
-  AwLocaleManagerImpl();
-  ~AwLocaleManagerImpl() override;
-
-  std::string GetLocale() override;
-
-  std::string GetLocaleList() override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(AwLocaleManagerImpl);
-};
-
-}  // namespace android_webview
-
-#endif  // ANDROID_WEBVIEW_BROWSER_AW_LOCALE_MANAGER_IMPL_H_