Prevent derived classes of GuestViewBase from overriding key methods

chrome/browser/guest_view/guest_view_base.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 "chrome/browser/guest_view/guest_view_base.h"
 
 #include "base/lazy_instance.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/guest_view/ad_view/ad_view_guest.h"
 #include "chrome/browser/guest_view/guest_view_constants.h"
@@ skipping 193 matching lines @@
   if (!in_extension())
     return;
 
   base::MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(&GuestViewBase::SendQueuedEvents,
                  weak_ptr_factory_.GetWeakPtr()));
 }
 
 void GuestViewBase::Destroy() {
+  WillBeDestroyed();
   if (!destruction_callback_.is_null())
     destruction_callback_.Run();
   delete guest_web_contents();
 }
 
 
 void GuestViewBase::SetOpener(GuestViewBase* guest) {
   if (guest && guest->IsViewType(GetViewType())) {
     opener_ = guest->AsWeakPtr();
     return;
@@ skipping 11 matching lines @@
     const char script[] = "window.addEventListener('dragstart', function() { "
                           "  window.event.preventDefault(); "
                           "});";
     render_view_host->GetMainFrame()->ExecuteJavaScript(
         base::ASCIIToUTF16(script));
   }
   DidStopLoading();
 }
 
 void GuestViewBase::WebContentsDestroyed() {
+  GuestDestroyed();
   delete this;
 }
 
 bool GuestViewBase::ShouldFocusPageAfterCrash() {
   // Focus is managed elsewhere.
   return false;
 }
 
 bool GuestViewBase::PreHandleGestureEvent(content::WebContents* source,
                                          const blink::WebGestureEvent& event) {
@@ skipping 44 matching lines @@
 
 void GuestViewBase::SendQueuedEvents() {
   if (!attached())
     return;
   while (!pending_events_.empty()) {
     linked_ptr<Event> event_ptr = pending_events_.front();
     pending_events_.pop_front();
     DispatchEvent(event_ptr.release());
   }
 }