Suppress JavaScript dialogs when a tab puts itself into fullscreen.

chrome/browser/prerender/prerender_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/prerender/prerender_contents.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <functional>
@@ skipping 129 matching lines @@
 
   bool OnGoToEntryOffset(int offset) override {
     // This isn't allowed because the history merge operation
     // does not work if there are renderer issued challenges.
     // TODO(cbentzel): Cancel in this case? May not need to do
     // since render-issued offset navigations are not guaranteed,
     // but indicates that the page cares about the history.
     return false;
   }
 
-  bool ShouldSuppressDialogs(WebContents* source) override {
+  bool ShouldSuppressDialogs(WebContents* source, bool before_unload) override {
     // We still want to show the user the message when they navigate to this
     // page, so cancel this prerender.
     prerender_contents_->Destroy(FINAL_STATUS_JAVASCRIPT_ALERT);
     // Always suppress JavaScript messages if they're triggered by a page being
     // prerendered.
     return true;
   }
 
   void RegisterProtocolHandler(WebContents* web_contents,
                                const std::string& protocol,
@@ skipping 558 matching lines @@
 void PrerenderContents::AddResourceThrottle(
     const base::WeakPtr<PrerenderResourceThrottle>& throttle) {
   resource_throttles_.push_back(throttle);
 }
 
 void PrerenderContents::AddNetworkBytes(int64_t bytes) {
   network_bytes_ += bytes;
 }
 
 }  // namespace prerender