Make window cycling work even if you change it to something else than cmd-` in sysprefs.

chrome/browser/cocoa/chrome_event_processing_window.h

 // 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.
 
 #ifndef CHROME_BROWSER_COCOA_CHROME_EVENT_PROCESSING_WINDOW_H_
 #define CHROME_BROWSER_COCOA_CHROME_EVENT_PROCESSING_WINDOW_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/scoped_nsobject.h"
 
 // Override NSWindow to access unhandled keyboard events (for command
 // processing); subclassing NSWindow is the only method to do
 // this.
-@interface ChromeEventProcessingWindow : NSWindow
+@interface ChromeEventProcessingWindow : NSWindow {
+ @private
+  BOOL redispatchingEvent_;
+}
+
+// Returns |YES| if |event| has been shortcircuited and should not be processed
+// further.
+- (BOOL)shortcircuitEvent:(NSEvent*)event;
+
+// Sends an event to |NSApp sendEvent:|, but also makes sure that it's not
+// short-circuited to the RWHV. This is used to send keyboard events to the menu
+// and the cmd-` handler if a keyboard event comes back unhandled from the
+// renderer.
+- (void)redispatchEvent:(NSEvent*)event;
 
 // See global_keyboard_shortcuts_mac.h for details on the next two functions.
 
 // Checks if |event| is a window keyboard shortcut. If so, dispatches it to the
 // window controller's |executeCommand:| and returns |YES|.
 - (BOOL)handleExtraWindowKeyboardShortcut:(NSEvent*)event;
 
 // Checks if |event| is a browser keyboard shortcut. If so, dispatches it to the
 // window controller's |executeCommand:| and returns |YES|.
 - (BOOL)handleExtraBrowserKeyboardShortcut:(NSEvent*)event;
 
 // Override, so we can handle global keyboard events.
 - (BOOL)performKeyEquivalent:(NSEvent*)theEvent;
 
 @end
 
 #endif  // CHROME_BROWSER_COCOA_CHROME_EVENT_PROCESSING_WINDOW_H_