Start pulling away notification logic from ChromeContentBrowserClient.

content/public/browser/content_browser_client.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 "content/public/browser/content_browser_client.h"
 
 #include "base/files/file_path.h"
 #include "ui/gfx/image/image_skia.h"
 #include "url/gurl.h"
 
@@ skipping 193 matching lines @@
     bool* in_memory) {
   partition_domain->clear();
   partition_name->clear();
   *in_memory = false;
 }
 
 MediaObserver* ContentBrowserClient::GetMediaObserver() {
   return NULL;
 }
 
-blink::WebNotificationPermission
-ContentBrowserClient::CheckDesktopNotificationPermission(
-    const GURL& source_origin,
-    ResourceContext* context,
-    int render_process_id) {
-  return blink::WebNotificationPermissionDenied;
+PlatformNotificationService*
+ContentBrowserClient::GetPlatformNotificationService() {
+  return NULL;
 }
 
 void ContentBrowserClient::RequestPermission(
     PermissionType permission,
     WebContents* web_contents,
     int bridge_id,
     const GURL& requesting_frame,
     bool user_gesture,
     const base::Callback<void(bool)>& result_callback) {
   result_callback.Run(true);
@@ skipping 109 matching lines @@
 
 #if defined(VIDEO_HOLE)
 ExternalVideoSurfaceContainer*
 ContentBrowserClient::OverrideCreateExternalVideoSurfaceContainer(
     WebContents* web_contents) {
   return NULL;
 }
 #endif
 
 }  // namespace content