Make escape exit tabbed fullscreen mode even if browser was in fullscreen mode before.

chrome/browser/ui/browser.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/ui/browser.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <shellapi.h>
 #endif  // OS_WIN
@@ skipping 3682 matching lines @@
                                  const GURL& frame_url,
                                  const std::string& frame_content_state) {
   DCHECK(source);
   int index = tabstrip_model()->GetWrapperIndex(source);
   TabContentsWrapper* wrapper = tabstrip_model()->GetTabContentsAt(index);
   ViewSource(wrapper, frame_url, frame_content_state);
 }
 
 bool Browser::PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
                                      bool* is_keyboard_shortcut) {
+  // Escape exits tabbed fullscreen mode.
+  // TODO(koz): Write a test for this http://crbug.com/100441.
+  if (event.windowsKeyCode == 27 && fullscreened_tab_) {
+    ExitTabbedFullscreenModeIfNecessary();
+    return true;
+  }
   return window()->PreHandleKeyboardEvent(event, is_keyboard_shortcut);
 }
 
 void Browser::HandleKeyboardEvent(const NativeWebKeyboardEvent& event) {
   window()->HandleKeyboardEvent(event);
 }
 
 void Browser::ShowRepostFormWarningDialog(TabContents *tab_contents) {
   window()->ShowRepostFormWarningDialog(tab_contents);
 }
@@ skipping 1593 matching lines @@
     window_->GetLocationBar()->ShowFirstRunBubble(bubble_type);
   } else if (is_type_tabbed()) {
     GlobalErrorService* service =
         GlobalErrorServiceFactory::GetForProfile(profile());
     GlobalError* error = service->GetFirstGlobalErrorWithBubbleView();
     if (error) {
       error->ShowBubbleView(this);
     }
   }
 }