Suppress JavaScript dialogs when a tab puts itself into fullscreen.

chrome/browser/background/background_contents.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/background/background_contents.h"
 
 #include <utility>
 
 #include "base/profiler/scoped_tracker.h"
 #include "chrome/browser/background/background_contents_service.h"
@@ skipping 105 matching lines @@
 }
 
 void BackgroundContents::CloseContents(WebContents* source) {
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_BACKGROUND_CONTENTS_CLOSED,
       content::Source<Profile>(profile_),
       content::Details<BackgroundContents>(this));
   delete this;
 }
 
-bool BackgroundContents::ShouldSuppressDialogs(WebContents* source) {
+bool BackgroundContents::ShouldSuppressDialogs(WebContents* source,
+                                               bool before_unload) {
   return true;
 }
 
 void BackgroundContents::DidNavigateMainFramePostCommit(WebContents* tab) {
   // Note: because BackgroundContents are only available to extension apps,
   // navigation is limited to urls within the app's extent. This is enforced in
   // RenderView::decidePolicyForNavigation. If BackgroundContents become
   // available as a part of the web platform, it probably makes sense to have
   // some way to scope navigation of a background page to its opener's security
   // origin. Note: if the first navigation is to a URL outside the app's
@@ skipping 79 matching lines @@
 
 void BackgroundContents::AddDeferredStartRenderHostObserver(
     extensions::DeferredStartRenderHostObserver* observer) {
   deferred_start_render_host_observer_list_.AddObserver(observer);
 }
 
 void BackgroundContents::RemoveDeferredStartRenderHostObserver(
     extensions::DeferredStartRenderHostObserver* observer) {
   deferred_start_render_host_observer_list_.RemoveObserver(observer);
 }