[OSX] Don't create deferred windows.

ui/message_center/cocoa/popup_controller.mm

 // Copyright (c) 2013 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 "ui/message_center/cocoa/popup_controller.h"
 
 #include <cmath>
 
 #import "base/mac/foundation_util.h"
 #import "base/mac/sdk_forward_declarations.h"
@@ skipping 85 matching lines @@
 @implementation MCPopupController
 
 - (id)initWithNotification:(const message_center::Notification*)notification
              messageCenter:(message_center::MessageCenter*)messageCenter
            popupCollection:(MCPopupCollection*)popupCollection {
   base::scoped_nsobject<MCPopupWindow> window(
       [[MCPopupWindow alloc] initWithContentRect:ui::kWindowSizeDeterminedLater
                                        styleMask:NSBorderlessWindowMask |
                                                  NSNonactivatingPanelMask
                                          backing:NSBackingStoreBuffered
-                                           defer:YES]);
+                                           defer:NO]);
   if ((self = [super initWithWindow:window])) {
     messageCenter_ = messageCenter;
     popupCollection_ = popupCollection;
     notificationController_.reset(
         [[MCNotificationController alloc] initWithNotification:notification
                                                  messageCenter:messageCenter_]);
     isClosing_ = NO;
     bounds_ = [[notificationController_ view] frame];
 
     [window setReleasedWhenClosed:NO];
@@ skipping 173 matching lines @@
 
 - (void)mouseEntered:(NSEvent*)event {
   messageCenter_->PausePopupTimers();
 }
 
 - (void)mouseExited:(NSEvent*)event {
   messageCenter_->RestartPopupTimers();
 }
 
 @end