Implement the PageNotificationDelegate for the new Web Notification path.

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 233039b2a53afe136a079a7b4813a47264a9a20e..7baddc6ea6000832cd22c498e2833418a49ef077 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -45,6 +45,7 @@ class BrowserDemuxerAndroid;
 class GpuMessageFilter;
 class MessagePortMessageFilter;
 class MojoApplicationHost;
+class NotificationMessageFilter;
 #if defined(ENABLE_WEBRTC)
 class P2PSocketDispatcherHost;
 #endif
@@ -241,6 +242,10 @@ class CONTENT_EXPORT RenderProcessHostImpl
     return message_port_message_filter_.get();
   }
 
+  NotificationMessageFilter* notification_message_filter() const {
+    return notification_message_filter_.get();
+  }
+
   void set_is_isolated_guest_for_testing(bool is_isolated_guest) {
     is_isolated_guest_ = is_isolated_guest;
   }
@@ -359,6 +364,10 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // The filter for MessagePort messages coming from the renderer.
   scoped_refptr<MessagePortMessageFilter> message_port_message_filter_;
 
+  // The filter for Web Notification messages coming from the renderer. Holds a
+  // closure per notification that must be freed when the notification closes.
+  scoped_refptr<NotificationMessageFilter> notification_message_filter_;
+
   // Used in single-process mode.
   scoped_ptr<base::Thread> in_process_renderer_;