Move ntp_tiles classes to namespace ntp_tiles.

chrome/browser/ui/webui/popular_sites_internals_message_handler.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 CHROME_BROWSER_UI_WEBUI_POPULAR_SITES_INTERNALS_MESSAGE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_POPULAR_SITES_INTERNALS_MESSAGE_HANDLER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
 namespace base {
 class ListValue;
 }  // namespace base
 
+namespace ntp_tiles {
 class PopularSites;
+}  // namespace ntp_tiles
 
 // The implementation for the chrome://popular-sites-internals page.
 class PopularSitesInternalsMessageHandler
     : public content::WebUIMessageHandler {
  public:
   PopularSitesInternalsMessageHandler();
   ~PopularSitesInternalsMessageHandler() override;
 
  private:
   // content::WebUIMessageHandler:
   void RegisterMessages() override;
 
   void HandleRegisterForEvents(const base::ListValue* args);
   void HandleUpdate(const base::ListValue* args);
   void HandleViewJson(const base::ListValue* args);
 
   void SendOverrides();
   void SendDownloadResult(bool success);
   void SendSites();
   void SendJson(const std::string& json);
 
   void OnPopularSitesAvailable(bool explicit_request, bool success);
 
-  std::unique_ptr<PopularSites> popular_sites_;
+  std::unique_ptr<ntp_tiles::PopularSites> popular_sites_;
 
   base::WeakPtrFactory<PopularSitesInternalsMessageHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PopularSitesInternalsMessageHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_POPULAR_SITES_INTERNALS_MESSAGE_HANDLER_H_