move favicon download code from chrome/ into content/

chrome/browser/ui/views/ash/balloon_view_ash.cc

Index: chrome/browser/ui/views/ash/balloon_view_ash.cc
diff --git a/chrome/browser/ui/views/ash/balloon_view_ash.cc b/chrome/browser/ui/views/ash/balloon_view_ash.cc
index 0e3d2420085f70d252826c88e91d0bee1e09f516..772ddf57ced392a362023cc9927be63b354b2e45 100644
--- a/chrome/browser/ui/views/ash/balloon_view_ash.cc
+++ b/chrome/browser/ui/views/ash/balloon_view_ash.cc
@@ -9,12 +9,10 @@
 #include "base/logging.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/favicon/favicon_download_helper.h"
 #include "chrome/browser/favicon/favicon_util.h"
 #include "chrome/browser/notifications/balloon_collection.h"
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/common/icon_messages.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/site_instance.h"
@@ -109,13 +107,13 @@ void BalloonViewAsh::FetchIcon(const Notification& notification) {
     LOG(WARNING) << "Notification has icon url but no WebContents";
     return;
   }
-  icon_fetcher_.reset(new FaviconDownloadHelper(web_contents, this));
-  current_download_id_ = icon_fetcher_->DownloadFavicon(
+  web_contents->RegisterFaviconDelegate(this);
+  current_download_id_ = web_contents->DownloadFavicon(
       notification.icon_url(), kNotificationIconImageSize);
   cached_notification_id_ = notification.notification_id();
 }
 
-void BalloonViewAsh::OnDidDownloadFavicon(
+void BalloonViewAsh::DidDownloadFavicon(
     int id,
     const GURL& image_url,
     bool errored,