SendPageMessage() should not send to a WebView guest's embedder.

content/browser/frame_host/render_frame_host_manager.cc

 // Copyright 2013 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/browser/frame_host/render_frame_host_manager.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <utility>
@@ skipping 2485 matching lines @@
     delete msg;
     return;
   }
 
   auto send_msg = [](IPC::Sender* sender, int routing_id, IPC::Message* msg) {
     IPC::Message* copy = new IPC::Message(*msg);
     copy->set_routing_id(routing_id);
     sender->Send(copy);
   };
 
-  for (const auto& pair : proxy_hosts_)
-    send_msg(pair.second.get(), pair.second->GetRoutingID(), msg);
+  // When sending a PageMessage for an inner WebContents, we don't want to also
+  // send it to the outer WebContent's frame as well.
+  RenderFrameProxyHost* outer_delegate_proxy =
+      ForInnerDelegate() ? GetProxyToOuterDelegate() : nullptr;
+  for (const auto& pair : proxy_hosts_) {
+    if (outer_delegate_proxy != pair.second.get())
+      send_msg(pair.second.get(), pair.second->GetRoutingID(), msg);
+  }
 
   if (speculative_render_frame_host_) {
     send_msg(speculative_render_frame_host_.get(),
              speculative_render_frame_host_->GetRoutingID(), msg);
   } else if (pending_render_frame_host_) {
     send_msg(pending_render_frame_host_.get(),
              pending_render_frame_host_->GetRoutingID(), msg);
   }
 
   msg->set_routing_id(render_frame_host_->GetRoutingID());
@@ skipping 29 matching lines @@
                                              resolved_url)) {
     DCHECK(!dest_instance ||
            dest_instance == render_frame_host_->GetSiteInstance());
     return false;
   }
 
   return true;
 }
 
 }  // namespace content