GuestView: Move lifetime management out of content

extensions/browser/guest_view/app_view/app_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/app_view/app_view_guest.h"
 
 #include "base/command_line.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/common/renderer_preferences.h"
 #include "extensions/browser/api/app_runtime/app_runtime_api.h"
@@ skipping 185 matching lines @@
       process_manager->GetBackgroundHostForExtension(guest_extension->id());
   DCHECK(host);
   LaunchAppAndFireEvent(make_scoped_ptr(data->DeepCopy()), callback, host);
 }
 
 void AppViewGuest::DidAttachToEmbedder() {
   // This is called after the guest process has been attached to a host
   // element. This means that the host element knows how to route input
   // events to the guest, and the guest knows how to get frames to the
   // embedder.
+  if (!url_.is_valid())
+    return;
+
   web_contents()->GetController().LoadURL(
       url_, content::Referrer(), ui::PAGE_TRANSITION_LINK, std::string());
+  url_ = GURL();
 }
 
 void AppViewGuest::DidInitialize() {
   extension_function_dispatcher_.reset(
       new ExtensionFunctionDispatcher(browser_context(), this));
 }
 
 void AppViewGuest::OnRequest(const ExtensionHostMsg_Request_Params& params) {
   extension_function_dispatcher_->Dispatch(params,
                                            web_contents()->GetRenderViewHost());
@@ skipping 33 matching lines @@
 
   scoped_ptr<base::DictionaryValue> embed_request(new base::DictionaryValue());
   embed_request->SetInteger(appview::kGuestInstanceID, guest_instance_id());
   embed_request->SetString(appview::kEmbedderID, embedder_extension_id());
   embed_request->Set(appview::kData, data.release());
   AppRuntimeEventRouter::DispatchOnEmbedRequestedEvent(
       browser_context(), embed_request.Pass(), extension_host->extension());
 }
 
 }  // namespace extensions