mash: switch to the new pref service

chrome/common/chrome_features.cc

 // Copyright 2016 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/common/chrome_features.h"
 
+#include "base/command_line.h"
+#include "chrome/common/chrome_switches.h"
 #include "extensions/features/features.h"
 #include "ppapi/features/features.h"
 
 namespace features {
 
 // All features in alphabetical order.
 
 #if defined(OS_ANDROID)
 const base::Feature kAllowAutoplayUnmutedInWebappManifestScope{
     "AllowAutoplayUnmutedInWebappManifestScope",
@@ skipping 282 matching lines @@
 
 // Enables or disables emoji, handwriting and voice input on opt-in IME menu.
 const base::Feature kEHVInputOnImeMenu{"EmojiHandwritingVoiceInput",
                                        base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables or disables flash component updates on Chrome OS.
 const base::Feature kCrosCompUpdates{"CrosCompUpdates",
                                      base::FEATURE_ENABLED_BY_DEFAULT};
 #endif  // defined(OS_CHROMEOS)
 
+bool PrefServiceEnabled() {
+  return base::FeatureList::IsEnabled(features::kPrefService) ||
+#if BUILDFLAG(ENABLE_PACKAGE_MASH_SERVICES)
+         base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+             switches::kMusConfig) == switches::kMash;
+#else
+         false;
+#endif
+}
+
 }  // namespace features