Prevent Chrome from crashing if a tab is closed while the media settings bubble is opea and a setti…

chrome/browser/ui/content_settings/content_setting_bubble_model.cc

 // Copyright (c) 2012 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/ui/content_settings/content_setting_bubble_model.h"
 
 #include "base/prefs/pref_service.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/content_settings/content_settings_utils.h"
 #include "chrome/browser/content_settings/cookie_settings.h"
@@ skipping 428 matching lines @@
     WebContents* web_contents,
     Profile* profile,
     ContentSettingsType content_type)
     : ContentSettingSingleRadioGroup(
           delegate, web_contents, profile, content_type) {
   DCHECK_EQ(CONTENT_SETTINGS_TYPE_COOKIES, content_type);
   set_custom_link_enabled(true);
 }
 
 ContentSettingCookiesBubbleModel::~ContentSettingCookiesBubbleModel() {
-  if (settings_changed()) {
+  // On some plattforms e.g. MacOS X it is possible to close a tab while the
+  // cookies settubgs bubble is open. This resets the web contents to NULL.
+  if (settings_changed() && web_contents()) {
     CollectedCookiesInfoBarDelegate::Create(
         InfoBarService::FromWebContents(web_contents()));
   }
 }
 
 void ContentSettingCookiesBubbleModel::OnCustomLinkClicked() {
   if (!web_contents())
     return;
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_COLLECTED_COOKIES_SHOWN,
@@ skipping 143 matching lines @@
   // buttons.
   radio_item_setting_[0] = CONTENT_SETTING_ASK;
   radio_item_setting_[1] = CONTENT_SETTING_BLOCK;
 
   SetTitle();
   SetRadioGroup();
   SetMediaMenus();
 }
 
 ContentSettingMediaStreamBubbleModel::~ContentSettingMediaStreamBubbleModel() {
+  // On some plattforms e.g. MacOS X it is possible to close a tab while the
+  // media stream bubble is open. This resets the web contents to NULL.
+  if (!web_contents())
+    return;
   bool media_setting_changed = false;
   for (MediaMenuMap::const_iterator it = bubble_content().media_menus.begin();
       it != bubble_content().media_menus.end(); ++it) {
     if (it->second.selected_device.id != it->second.default_device.id) {
       UpdateDefaultDeviceForType(it->first, it->second.selected_device.id);
       media_setting_changed = true;
     }
   }
 
   // Update the media settings if the radio button selection was changed.
@@ skipping 488 matching lines @@
   if (type == content::NOTIFICATION_WEB_CONTENTS_DESTROYED) {
     DCHECK_EQ(web_contents_,
               content::Source<WebContents>(source).ptr());
     web_contents_ = NULL;
   } else {
     DCHECK_EQ(chrome::NOTIFICATION_PROFILE_DESTROYED, type);
     DCHECK_EQ(profile_, content::Source<Profile>(source).ptr());
     profile_ = NULL;
   }
 }