Rewrite scoped_ptr<T>(NULL) to use the default ctor in chrome/.

chrome/browser/chromeos/net/network_portal_detector_stub.cc

 // 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 "chrome/browser/chromeos/net/network_portal_detector_stub.h"
 
 #include "chromeos/network/network_state.h"
 
 namespace chromeos {
 
-NetworkPortalDetectorStub::NetworkPortalDetectorStub()
-  : default_network_(NULL) {
-}
+NetworkPortalDetectorStub::NetworkPortalDetectorStub() {}
 
 NetworkPortalDetectorStub::~NetworkPortalDetectorStub() {
 }
 
 void NetworkPortalDetectorStub::Init() {
 }
 
 void NetworkPortalDetectorStub::Shutdown() {
 }
 
@@ skipping 67 matching lines @@
   CaptivePortalState state;
   if (default_network_ &&
       portal_state_map_.count(default_network_->path())) {
     state = portal_state_map_[default_network_->path()];
   }
   FOR_EACH_OBSERVER(Observer, observers_,
                     OnPortalDetectionCompleted(default_network_.get(), state));
 }
 
 }  // namespace chromeos