Add ArcEnabled policy implementation

components/arc/arc_bridge_bootstrap.cc

 // Copyright 2015 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 "components/arc/arc_bridge_bootstrap.h"
 
 #include <fcntl.h>
 #include <grp.h>
 #include <unistd.h>
 
@@ skipping 323 matching lines @@
 void ArcBridgeBootstrapImpl::SetState(State state) {
   DCHECK(thread_checker_.CalledOnValidThread());
   // DCHECK on enum classes not supported.
   DCHECK(state_ != state);
   state_ = state;
 }
 
 }  // namespace
 
 ArcBridgeBootstrap::ArcBridgeBootstrap() {}
+
 ArcBridgeBootstrap::~ArcBridgeBootstrap() {}
 
 // static
 scoped_ptr<ArcBridgeBootstrap> ArcBridgeBootstrap::Create() {
   return make_scoped_ptr(new ArcBridgeBootstrapImpl());
 }
 
 }  // namespace arc