Make it possible to disable dbus on linux

content/browser/power_save_blocker_empty.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 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 "content/browser/power_save_blocker_impl.h"
 
-#include "base/logging.h"
-
 namespace content {
 
 class PowerSaveBlockerImpl::Delegate
     : public base::RefCounted<PowerSaveBlockerImpl::Delegate> {
  private:
   friend class base::RefCounted<Delegate>;
   ~Delegate() {}
 };
 
 PowerSaveBlockerImpl::PowerSaveBlockerImpl(PowerSaveBlockerType type,
                                            const std::string& reason) {
-  // TODO(wangxianzhu): Implement it.
-  // This may be called on any thread.
-  NOTIMPLEMENTED();
 }
 
 PowerSaveBlockerImpl::~PowerSaveBlockerImpl() {
 }
 
 }  // namespace content
+