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

chrome/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2006-2008 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_widget_host_view_mac.h"
 
 #include "base/histogram.h"
 #include "base/scoped_nsobject.h"
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
@@ skipping 518 matching lines @@
   // popup. A click outside the text field would cause the text field to drop
   // the focus, and then EditorClientImpl::textFieldDidEndEditing() would cancel
   // the popup anyway, so we're OK.
 
   const WebMouseEvent& event =
       WebInputEventFactory::mouseEvent(theEvent, self);
   if (renderWidgetHostView_->render_widget_host_)
     renderWidgetHostView_->render_widget_host_->ForwardMouseEvent(event);
 }
 
+- (void)setIgnoreKeyEvents:(BOOL)ignorekeyEvents {
+  ignoreKeyEvents_ = ignorekeyEvents;
+}
+
 - (BOOL)performKeyEquivalent:(NSEvent*)theEvent {
+  if (ignoreKeyEvents_)
+    return NO;
+
   // We have some magic in |CrApplication sendEvent:| that always sends key 
   // events to |keyEvent:| so that cocoa doesn't have a chance to intercept it.
   DCHECK([[self window] firstResponder] != self);
   return NO;
 }
 
 - (void)keyEvent:(NSEvent*)theEvent {
+  if (ignoreKeyEvents_)
+    return;
+
   // TODO(avi): Possibly kill self? See RenderWidgetHostViewWin::OnKeyEvent and
   // http://b/issue?id=1192881 .
 
   // Don't cancel child popups; the key events are probably what's triggering
   // the popup in the first place.
 
   NativeWebKeyboardEvent event(theEvent);
 
   // Save the modifier keys so the insertText method can use it when it sends
   // a Char event, which is dispatched as an onkeypress() event of JavaScript.
@@ skipping 682 matching lines @@
     renderWidgetHostView_->render_widget_host_->ForwardKeyboardEvent(event);
   } else {
     renderWidgetHostView_->render_widget_host_->ImeConfirmComposition(
         UTF8ToUTF16([im_text UTF8String]));
   }
   renderWidgetHostView_->im_composing_ = false;
 }
 
 @end