Move app_launcher.* out of chrome/browser/extensions and into apps/

apps/prefs.cc

+// Copyright 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.
+
+#include "apps/prefs.h"
+
+#include "apps/app_launcher.h"
+#include "apps/pref_names.h"
+#include "base/prefs/pref_registry_simple.h"
+
+namespace apps {
+
+void RegisterPrefs(PrefRegistrySimple* registry) {
+  // This pref is a cache of the value from the registry the last time it was
+  // checked.
+  //
+  // During the pref initialization, if it is impossible to synchronously
+  // determine whether the app launcher is enabled, assume it is disabled.
+  // Anything that needs to know the absolute truth should call
+  // GetIsAppLauncherEnabled().
+  registry->RegisterBooleanPref(prefs::kAppLauncherIsEnabled,
+                                MaybeIsAppLauncherEnabled());
+}
+
+}  // namespace apps