Convert push_messaging IPC msgs into mojo interfaces

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 8fb3a0f6840f3529e8f221bf4b6eb0b482f7663d..1eac862663f1a142b3979b4f6218164cfb248d42 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -66,6 +66,7 @@ class P2PSocketDispatcherHost;
 #endif
 class PermissionServiceContext;
 class PeerConnectionTrackerHost;
+class PushMessagingManager;
 class RenderFrameMessageFilter;
 class RenderWidgetHelper;
 class RenderWidgetHost;
@@ -590,6 +591,8 @@ class CONTENT_EXPORT RenderProcessHostImpl
 
   scoped_refptr<ResourceMessageFilter> resource_message_filter_;
   std::unique_ptr<GpuClient, BrowserThread::DeleteOnIOThread> gpu_client_;
+  std::unique_ptr<PushMessagingManager, BrowserThread::DeleteOnIOThread>
+      push_messaging_manager_;
 
   std::unique_ptr<OffscreenCanvasCompositorFrameSinkProviderImpl>
       offscreen_canvas_provider_;