<webview>: Speculative crash fix

chrome/browser/guestview/guestview.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 "chrome/browser/guestview/guestview.h"
 
 #include "base/lazy_instance.h"
 #include "chrome/browser/guestview/adview/adview_guest.h"
 #include "chrome/browser/guestview/guestview_constants.h"
 #include "chrome/browser/guestview/webview/webview_guest.h"
@@ skipping 28 matching lines @@
 
 GuestView::Event::~Event() {
 }
 
 scoped_ptr<base::DictionaryValue> GuestView::Event::GetArguments() {
   return args_.Pass();
 }
 
 GuestView::GuestView(WebContents* guest_web_contents,
                      const std::string& extension_id)
-    : guest_web_contents_(guest_web_contents),
+    : weak_ptr_factory_(this),
+      guest_web_contents_(guest_web_contents),
       embedder_web_contents_(NULL),
       extension_id_(extension_id),
       embedder_render_process_id_(0),
       browser_context_(guest_web_contents->GetBrowserContext()),
       guest_instance_id_(guest_web_contents->GetEmbeddedInstanceID()),
       view_instance_id_(guestview::kInstanceIDNone) {
   webcontents_guestview_map.Get().insert(
       std::make_pair(guest_web_contents, this));
 }
 
@@ skipping 90 matching lines @@
   // GuestView::Attach is called prior to initialization (and initial
   // navigation) of the guest in the content layer in order to permit mapping
   // the necessary associations between the <*view> element and its guest. This
   // is needed by the <webview> WebRequest API to allow intercepting resource
   // requests during navigation. However, queued events should be fired after
   // content layer initialization in order to ensure that load events (such as
   // 'loadstop') fire in embedder after the contentWindow is available.
   base::MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(&GuestView::SendQueuedEvents,
-                  base::Unretained(this)));
+                 weak_ptr_factory_.GetWeakPtr()));
 }
 
 GuestView::Type GuestView::GetViewType() const {
   return GuestView::UNKNOWN;
 }
 
 WebViewGuest* GuestView::AsWebView() {
   return NULL;
 }
 
@@ skipping 38 matching lines @@
 void GuestView::SendQueuedEvents() {
   if (!attached())
     return;
 
   while (!pending_events_.empty()) {
     Event* event = pending_events_.front();
     pending_events_.pop();
     DispatchEvent(event);
   }
 }