[Push] Use Manifest.gcm_sender_id instead of API sender_id if possible.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index fcea3a175e2bace23a8533186db30399b5920b30..616ea3ab877c61f97c40a69c957a09c8b7161fcf 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1006,6 +1006,10 @@ void RenderFrameImpl::BindServiceRegistry(
   service_registry_.BindRemoteServiceProvider(service_provider_handle.Pass());
 }
 
+ManifestManager* RenderFrameImpl::manifest_manager() {
+  return manifest_manager_;
+}
+
 void RenderFrameImpl::OnBeforeUnload() {
   TRACE_EVENT1("navigation", "RenderFrameImpl::OnBeforeUnload",
                "id", routing_id_);