Mac: Make content shell work with remote CoreAnimation

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 "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 138 matching lines @@
   // 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]);
 
   [[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())
+      @"NSTreatUnknownArgumentsAsOpen": @"NO"
   }];
 }
 
 void ChromeBrowserMainPartsMac::PostMainMessageLoopStart() {
   MacStartupProfiler::GetInstance()->Profile(
       MacStartupProfiler::POST_MAIN_MESSAGE_LOOP_START);
   ChromeBrowserMainPartsPosix::PostMainMessageLoopStart();
 }
 
 void ChromeBrowserMainPartsMac::PreProfileInit() {
@@ skipping 19 matching lines @@
   // TODO(calamity): Make this gated on first_run::IsChromeFirstRun() in M45.
   content::BrowserThread::PostAfterStartupTask(
       FROM_HERE, base::ThreadTaskRunnerHandle::Get(),
       base::Bind(&EnsureMetadataNeverIndexFile, user_data_dir()));
 }
 
 void ChromeBrowserMainPartsMac::DidEndMainMessageLoop() {
   AppController* appController = [NSApp delegate];
   [appController didEndMainMessageLoop];
 }