Remove the strict dependency on WebContents for Web Notifications.

content/browser/frame_host/render_frame_host_impl.cc

 // Copyright 2013 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 "content/browser/frame_host/render_frame_host_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/lazy_instance.h"
@@ skipping 930 matching lines @@
 
 void RenderFrameHostImpl::OnShowDesktopNotification(
     int notification_id,
     const ShowDesktopNotificationHostMsgParams& params) {
   scoped_ptr<DesktopNotificationDelegateImpl> delegate(
       new DesktopNotificationDelegateImpl(this, notification_id));
 
   base::Closure cancel_callback;
   GetContentClient()->browser()->ShowDesktopNotification(
       params,
-      this,
+      GetSiteInstance()->GetBrowserContext(),
       delegate.PassAs<DesktopNotificationDelegate>(),
       &cancel_callback);
   cancel_notification_callbacks_[notification_id] = cancel_callback;
 }
 
 void RenderFrameHostImpl::OnCancelDesktopNotification(int notification_id) {
   if (!cancel_notification_callbacks_.count(notification_id)) {
     NOTREACHED();
     return;
   }
@@ skipping 491 matching lines @@
   // Clear any state if a pending navigation is canceled or preempted.
   if (suspended_nav_params_)
     suspended_nav_params_.reset();
 
   TRACE_EVENT_ASYNC_END0("navigation",
                          "RenderFrameHostImpl navigation suspended", this);
   navigations_suspended_ = false;
 }
 
 }  // namespace content