Restrict CM API interface request and message dispatch.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index 47514f727c7221534c756cf7edf0585a7dd69657..6e60e00be3a804b2f609942f1da4ac1071d02f44 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -910,9 +910,11 @@ bool RenderFrameHostImpl::OnMessageReceived(const IPC::Message &msg) {
 void RenderFrameHostImpl::OnAssociatedInterfaceRequest(
     const std::string& interface_name,
     mojo::ScopedInterfaceEndpointHandle handle) {
+  auto* browser_client = GetContentClient()->browser();

[vasilii, 2017/07/03 13:59:47]

I'd prefer ContentBrowserClient*

[engedy, 2017/07/03 14:31:13]

Done.

   if (associated_registry_->CanBindRequest(interface_name)) {
     associated_registry_->BindRequest(interface_name, std::move(handle));
-  } else {
+  } else if (!browser_client->BindAssociatedInterfaceRequestFromFrame(
+                 this, interface_name, &handle)) {
     delegate_->OnAssociatedInterfaceRequest(this, interface_name,
                                             std::move(handle));
   }