[Popular Sites] Split PopularSites interface and PopularSitesImpl

components/ntp_tiles/webui/popular_sites_internals_message_handler.h

 // Copyright 2016 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 COMPONENTS_NTP_TILES_WEBUI_POPULAR_SITES_HANDLER_H_
 #define COMPONENTS_NTP_TILES_WEBUI_POPULAR_SITES_HANDLER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 
 namespace base {
 class ListValue;
 }  // namespace base
 
 namespace ntp_tiles {
 
-class PopularSites;
+class PopularSitesImpl;
 class PopularSitesInternalsMessageHandlerClient;
 
 // Implements the WebUI message handler for chrome://popular-sites-internals/
 //
 // Because content and iOS use different implementations of WebUI, this class
 // implements the generic portion and depends on the embedder to inject a bridge
 // to the embedder's API. It cannot itself implement either API directly.
 class PopularSitesInternalsMessageHandler {
  public:
   explicit PopularSitesInternalsMessageHandler(
@@ skipping 14 matching lines @@
   void SendDownloadResult(bool success);
   void SendSites();
   void SendJson(const std::string& json);
 
   // Completion handler for popular_sites_->StartFetch().
   void OnPopularSitesAvailable(bool explicit_request, bool success);
 
   // Bridge to embedder's API.
   PopularSitesInternalsMessageHandlerClient* web_ui_;
 
-  std::unique_ptr<PopularSites> popular_sites_;
+  std::unique_ptr<PopularSitesImpl> popular_sites_;
 
   base::WeakPtrFactory<PopularSitesInternalsMessageHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PopularSitesInternalsMessageHandler);
 };
 
 }  // namespace ntp_tiles
 
 #endif  // COMPONENTS_NTP_TILES_WEBUI_POPULAR_SITES_HANDLER_H_