Mac: Fix registration of user defaults.

chrome/browser/chrome_browser_main_mac.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.
 
 #include "chrome/browser/chrome_browser_main_mac.h"
 
 #import <Cocoa/Cocoa.h>
 #include <sys/sysctl.h>
 
 #include "base/command_line.h"
@@ skipping 211 matching lines @@
   // Now load the nib (from the right bundle).
   base::scoped_nsobject<NSNib> nib(
       [[NSNib alloc] initWithNibNamed:@"MainMenu"
                                bundle:base::mac::FrameworkBundle()]);
   // TODO(viettrungluu): crbug.com/20504 - This currently leaks, so if you
   // change this, you'll probably need to change the Valgrind suppression.
   [nib instantiateNibWithOwner:NSApp topLevelObjects:nil];
   // Make sure the app controller has been created.
   DCHECK([NSApp delegate]);
 
-  // Prevent Cocoa from turning command-line arguments into
-  // |-application:openFiles:|, since we already handle them directly.
-  [[NSUserDefaults standardUserDefaults]
-      setObject:@"NO" forKey:@"NSTreatUnknownArgumentsAsOpen"];
-  // CoreAnimation has poor performance and CoreAnimation and non-CoreAnimation
-  // exhibit window flickering when layers are not hosted in the window server,
-  // which is the default when not not using the 10.9 SDK.
-  // TODO: Remove this when we build with the 10.9 SDK.
-  if (base::mac::IsOSMavericksOrLater())
-    [[NSUserDefaults standardUserDefaults]
-        setObject:@"YES"
-          forKey:@"NSWindowHostsLayersInWindowServer"];
+  [[NSUserDefaults standardUserDefaults] registerDefaults:@{
+      // Prevent Cocoa from turning command-line arguments into
+      // |-application:openFiles:|, since we already handle them directly.
+      // @"NO" looks like a mistake, but the value really is supposed to be a
+      // string.
+      @"NSTreatUnknownArgumentsAsOpen": @"NO",
+      // CoreAnimation has poor performance and CoreAnimation and
+      // non-CoreAnimation exhibit window flickering when layers are not hosted
+      // in the window server, which is the default when not not using the
+      // 10.9 SDK.
+      // TODO: Remove this when we build with the 10.9 SDK.
+      @"NSWindowHostsLayersInWindowServer": @(base::mac::IsOSMavericksOrLater())
+  }];
 }
 
 void ChromeBrowserMainPartsMac::PostProfileInit() {
   ChromeBrowserMainPartsPosix::PostProfileInit();
   g_browser_process->metrics_service()->RecordBreakpadRegistration(
       breakpad::IsCrashReporterEnabled());
 }
 
 void ChromeBrowserMainPartsMac::DidEndMainMessageLoop() {
   AppController* appController = [NSApp delegate];
   [appController didEndMainMessageLoop];
 }