Always enable FCM on Windows.

content/shell/app/shell_main_delegate.cc

 // 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 "content/shell/app/shell_main_delegate.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/path_service.h"
@@ skipping 105 matching lines @@
     EnableBrowserLayoutTestMode();
 
     command_line.AppendSwitch(switches::kProcessPerTab);
     command_line.AppendSwitch(switches::kEnableLogging);
     command_line.AppendSwitch(switches::kAllowFileAccessFromFiles);
 #if !defined(OS_ANDROID)
     // OSMesa is not yet available for Android. http://crbug.com/248925
     command_line.AppendSwitchASCII(
         switches::kUseGL, gfx::kGLImplementationOSMesaName);
 #endif
-    command_line.AppendSwitch(switches::kSkipGpuDataLoading);
     command_line.AppendSwitch(switches::kDisableGpuVsync);
     command_line.AppendSwitchASCII(switches::kTouchEvents,
                                    switches::kTouchEventsEnabled);
     command_line.AppendSwitch(switches::kEnableGestureTapHighlight);
     command_line.AppendSwitchASCII(switches::kForceDeviceScaleFactor, "1.0");
 #if defined(OS_ANDROID)
     command_line.AppendSwitch(
         switches::kDisableGestureRequirementForMediaPlayback);
     // Capturing pixel results does not yet work when implementation-side
     // painting is enabled. See http://crbug.com/250777
@@ skipping 88 matching lines @@
   browser_client_.reset(new ShellContentBrowserClient);
   return browser_client_.get();
 }
 
 ContentRendererClient* ShellMainDelegate::CreateContentRendererClient() {
   renderer_client_.reset(new ShellContentRendererClient);
   return renderer_client_.get();
 }
 
 }  // namespace content