Remove unnecessary image downloading handler of notifications.

chrome/browser/status_icons/desktop_notification_balloon.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/status_icons/desktop_notification_balloon.h"
 
 #include "base/bind.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/threading/thread_restrictions.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 30 matching lines @@
   virtual void Display() OVERRIDE {
     base::MessageLoop::current()->PostDelayedTask(
         FROM_HERE,
         base::Bind(&CloseBalloon, id()),
         base::TimeDelta::FromSeconds(kTimeoutSeconds));
   }
   virtual void Error() OVERRIDE {}
   virtual void Close(bool by_user) OVERRIDE {}
   virtual void Click() OVERRIDE {}
   virtual std::string id() const OVERRIDE { return id_; }
-  virtual content::WebContents* GetWebContents() const OVERRIDE {
-    return NULL;
-  }
 
  private:
   virtual ~DummyNotificationDelegate() {}
 
   std::string id_;
 };
 
 }  // anonymous namespace
 
 int DesktopNotificationBalloon::id_count_ = 1;
@@ skipping 15 matching lines @@
   // IO access won't be required for normal uses.
   Profile* profile;
   {
     base::ThreadRestrictions::ScopedAllowIO allow_io;
     profile = ProfileManager::GetLastUsedProfile();
   }
   notification_id_ = DesktopNotificationService::AddIconNotification(
       GURL(), title, contents, gfx::Image(icon), base::string16(),
       new DummyNotificationDelegate(base::IntToString(id_count_++)), profile);
 }