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

content/browser/renderer_host/render_view_host.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 "content/browser/renderer_host/render_view_host.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 1198 matching lines @@
 void RenderViewHost::OnMsgSelectionChanged(const std::string& text) {
   if (view())
     view()->SelectionChanged(text);
 }
 
 void RenderViewHost::OnMsgRunJavaScriptMessage(
     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) {
   // While a JS message dialog is showing, tabs in the same process shouldn't
   // process input events.
   process()->set_ignore_input_events(true);
   StopHangMonitorTimeout();
   delegate_->RunJavaScriptMessage(message, default_prompt, frame_url, flags,
-                                  reply_msg,
+                                  unload_handler_being_run, reply_msg,
                                   &are_javascript_messages_suppressed_);
 }
 
 void RenderViewHost::OnMsgRunBeforeUnloadConfirm(const GURL& frame_url,
                                                  const std::wstring& message,
                                                  IPC::Message* reply_msg) {
   // While a JS before unload dialog is showing, tabs in the same process
   // shouldn't process input events.
   process()->set_ignore_input_events(true);
   StopHangMonitorTimeout();
@@ skipping 466 matching lines @@
     LOG(DFATAL) << "Invalid checked state " << checked_state;
     return;
   }
 
   CommandState state;
   state.is_enabled = is_enabled;
   state.checked_state =
       static_cast<RenderViewCommandCheckedState>(checked_state);
   command_states_[static_cast<RenderViewCommand>(command)] = state;
 }