Extract Favicon Download logic from FaviconTabHelper

chrome/browser/favicon/favicon_tab_helper.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/favicon/favicon_tab_helper.h"
 
+#include "chrome/browser/favicon/favicon_download_helper.h"
 #include "chrome/browser/favicon/favicon_handler.h"
 #include "chrome/browser/favicon/favicon_service_factory.h"
 #include "chrome/browser/favicon/favicon_util.h"
 #include "chrome/browser/history/history.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/icon_messages.h"
 #include "content/public/browser/favicon_status.h"
@@ skipping 121 matching lines @@
   favicon_handler_->OnUpdateFaviconURL(page_id, candidates);
   if (touch_icon_handler_.get())
     touch_icon_handler_->OnUpdateFaviconURL(page_id, candidates);
 }
 
 NavigationEntry* FaviconTabHelper::GetActiveEntry() {
   return web_contents()->GetController().GetActiveEntry();
 }
 
 int FaviconTabHelper::StartDownload(const GURL& url, int image_size) {
-  content::RenderViewHost* host = web_contents()->GetRenderViewHost();
-  int id = FaviconUtil::DownloadFavicon(host, url, image_size);
+  FaviconDownloadHelper::CreateForWebContents(web_contents());
+  FaviconDownloadHelper* helper =
+      FaviconDownloadHelper::FromWebContents(web_contents());
+  int id = -1;
+
+  if (helper) {
+    helper->SetExternalDelegate(this);
+    id = helper->DownloadFavicon(url, image_size);
+  }
   return id;
 }
 
 void FaviconTabHelper::NotifyFaviconUpdated() {
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_FAVICON_UPDATED,
       content::Source<WebContents>(web_contents()),
       content::NotificationService::NoDetails());
   web_contents()->NotifyNavigationStateChanged(content::INVALIDATE_TYPE_TAB);
 }
@@ skipping 13 matching lines @@
 void FaviconTabHelper::DidNavigateMainFrame(
     const content::LoadCommittedDetails& details,
     const content::FrameNavigateParams& params) {
   // Get the favicon, either from history or request it from the net.
   FetchFavicon(details.entry->GetURL());
 }
 
 bool FaviconTabHelper::OnMessageReceived(const IPC::Message& message) {
   bool message_handled = false;   // Allow other handlers to receive these.
   IPC_BEGIN_MESSAGE_MAP(FaviconTabHelper, message)
-    IPC_MESSAGE_HANDLER(IconHostMsg_DidDownloadFavicon, OnDidDownloadFavicon)
     IPC_MESSAGE_HANDLER(IconHostMsg_UpdateFaviconURL, OnUpdateFaviconURL)
     IPC_MESSAGE_UNHANDLED(message_handled = false)
   IPC_END_MESSAGE_MAP()
   return message_handled;
 }
 
 void FaviconTabHelper::OnDidDownloadFavicon(
     int id,
     const GURL& image_url,
     bool errored,
     int requested_size,
     const std::vector<SkBitmap>& bitmaps) {
   favicon_handler_->OnDidDownloadFavicon(
       id, image_url, errored, requested_size, bitmaps);
   if (touch_icon_handler_.get()) {
     touch_icon_handler_->OnDidDownloadFavicon(
         id, image_url, errored, requested_size, bitmaps);
   }
 }