[OSX] Don't create deferred windows.

chrome/browser/ui/cocoa/tabs/tab_window_controller.mm

 // Copyright (c) 2012 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.
 
 #import "chrome/browser/ui/cocoa/tabs/tab_window_controller.h"
 
 #include "base/logging.h"
 #import "chrome/browser/ui/cocoa/browser_window_layout.h"
 #import "chrome/browser/ui/cocoa/fast_resize_view.h"
 #import "chrome/browser/ui/cocoa/framed_browser_window.h"
@@ skipping 134 matching lines @@
                                            selector:@selector(removeOverlay)
                                              object:nil];
   NSWindow* window = [self window];
   if (useOverlay && !overlayWindow_) {
     DCHECK(!originalContentView_);
 
     overlayWindow_ = [[TabWindowOverlayWindow alloc]
                          initWithContentRect:[window frame]
                                    styleMask:NSBorderlessWindowMask
                                      backing:NSBackingStoreBuffered
-                                       defer:YES];
+                                       defer:NO];
     [overlayWindow_ setTitle:@"overlay"];
     [overlayWindow_ setBackgroundColor:[NSColor clearColor]];
     [overlayWindow_ setOpaque:NO];
     [overlayWindow_ setDelegate:self];
     [[overlayWindow_ contentView] setWantsLayer:YES];
 
     originalContentView_ = self.chromeContentView;
     [window addChildWindow:overlayWindow_ ordered:NSWindowAbove];
 
     // Explicitly set the responder to be nil here (for restoring later).
@@ skipping 169 matching lines @@
             relativeTo:nil];
 }
 
 // Called when the size of the window content area has changed. Override to
 // position specific views. Base class implementation does nothing.
 - (void)layoutSubviews {
   NOTIMPLEMENTED();
 }
 
 @end