Remove the RenderProcessHost observer and attach the WebContentsObserver earlier to the GuestView.

extensions/browser/guest_view/web_view/web_view_guest.cc

 // Copyright 2014 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 "extensions/browser/guest_view/web_view/web_view_guest.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/browser_context.h"
@@ skipping 816 matching lines @@
           web_contents->GetRoutingID()));
 }
 
 content::WebContents* WebViewGuest::CreateNewGuestWindow(
     const content::WebContents::CreateParams& create_params) {
   GuestViewManager* guest_manager =
       GuestViewManager::FromBrowserContext(browser_context());
   return guest_manager->CreateGuestWithWebContentsParams(
       WebViewGuest::Type,
       embedder_extension_id(),
-      embedder_web_contents()->GetRenderProcessHost()->GetID(),
+      embedder_web_contents(),
       create_params);
 }
 
 void WebViewGuest::RequestMediaAccessPermission(
     content::WebContents* source,
     const content::MediaStreamRequest& request,
     const content::MediaResponseCallback& callback) {
   web_view_permission_helper_->RequestMediaAccessPermission(source,
                                                             request,
                                                             callback);
@@ skipping 370 matching lines @@
   WebViewGuest* guest =
       WebViewGuest::From(embedder_render_process_id(), new_window_instance_id);
   if (!guest)
     return;
 
   if (!allow)
     guest->Destroy();
 }
 
 }  // namespace extensions