Ignore JavaScript messages (alert/confirm/prompt) during unload handlers.

chrome/browser/prerender/prerender_contents.cc

 // Copyright (c) 2011 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 "base/process_util.h"
 #include "base/task.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/background_contents_service.h"
@@ skipping 201 matching lines @@
 
   title_ = WideToUTF16Hack(title);
   page_id_ = page_id;
 }
 
 void PrerenderContents::RunJavaScriptMessage(
     const std::wstring& message,
     const std::wstring& default_prompt,
     const GURL& frame_url,
     const int flags,
+    const bool unload_handler_being_run,
     IPC::Message* reply_msg,
     bool* did_suppress_message) {
   // Always suppress JavaScript messages if they're triggered by a page being
   // prerendered.
   *did_suppress_message = true;
   // We still want to show the user the message when they navigate to this
   // page, so cancel this prerender.
   Destroy(FINAL_STATUS_JAVASCRIPT_ALERT);
 }
 
@@ skipping 230 matching lines @@
     return;
 
   size_t private_bytes, shared_bytes;
   if (metrics->GetMemoryBytes(&private_bytes, &shared_bytes)) {
     if (private_bytes > kMaxPrerenderPrivateMB * 1024 * 1024)
       Destroy(FINAL_STATUS_MEMORY_LIMIT_EXCEEDED);
   }
 }
 
 }  // namespace prerender