Prevents a duplicate beforeunload dialog after window.close()....

chrome/browser/renderer_host/render_view_host.cc

 // Copyright (c) 2009 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/renderer_host/render_view_host.h"
 
 #include <string>
 #include <vector>
 
 #include "app/l10n_util.h"
@@ skipping 977 matching lines @@
                                     const SkBitmap& bitmap) {
   delegate_->UpdateThumbnail(url, bitmap, score);
 }
 
 void RenderViewHost::OnUpdateInspectorSettings(
     const std::wstring& raw_settings) {
   delegate_->UpdateInspectorSettings(raw_settings);
 }
 
 void RenderViewHost::OnMsgClose() {
-  delegate_->Close(this);
+  // If the renderer is telling us to close, it has already run the unload
+  // events, and we can take the fast path.
+  ClosePageIgnoringUnloadEvents();
 }
 
 void RenderViewHost::OnMsgRequestMove(const gfx::Rect& pos) {
   delegate_->RequestMove(pos);
   Send(new ViewMsg_Move_ACK(routing_id()));
 }
 
 void RenderViewHost::OnMsgDidRedirectProvisionalLoad(int32 page_id,
                                                      const GURL& source_url,
                                                      const GURL& target_url) {
@@ skipping 676 matching lines @@
 #endif
 }
 
 void RenderViewHost::OnCSSInserted() {
   delegate_->DidInsertCSS();
 }
 
 void RenderViewHost::UpdateBrowserWindowId(int window_id) {
   Send(new ViewMsg_UpdateBrowserWindowId(routing_id(), window_id));
 }