Remove ImageSkia::empty and ImageSkia::extractSubset

chrome/browser/ui/views/ash/balloon_view_ash.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/ui/views/ash/balloon_view_ash.h"
 
 #include "ash/shell.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/system/web_notification/web_notification_tray.h"
 #include "base/logging.h"
@@ skipping 115 matching lines @@
 
 gfx::Size BalloonViewAsh::GetSize() const {
   return gfx::Size();
 }
 
 BalloonHost* BalloonViewAsh::GetHost() const {
   return NULL;
 }
 
 void BalloonViewAsh::FetchIcon(const Notification& notification) {
-  if (!notification.icon().empty()) {
+  if (!notification.icon().isNull()) {
     ash::Shell::GetInstance()->status_area_widget()->
         web_notification_tray()->SetNotificationImage(
             notification.notification_id(), notification.icon());
     return;
   }
   if (notification.icon_url().is_empty())
     return;
   content::RenderViewHost* rvh = notification.GetRenderViewHost();
   if (!rvh) {
     LOG(WARNING) << "Notification has icon url but no RenderViewHost";
@@ skipping 14 matching lines @@
   ExtensionService* extension_service =
       balloon_->profile()->GetExtensionService();
   const GURL& origin = balloon_->notification().origin_url();
   const extensions::Extension* extension =
       extension_service->extensions()->GetExtensionOrAppByURL(
           ExtensionURLInfo(origin));
   if (extension)
     return extension->id();
   return std::string();
 }