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

chrome/browser/background/background_application_list_model.cc

 // Copyright (c) 2012 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/background/background_application_list_model.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/stl_util.h"
@@ skipping 121 matching lines @@
 
 BackgroundApplicationListModel::Observer::~Observer() {
 }
 
 BackgroundApplicationListModel::Application::~Application() {
 }
 
 BackgroundApplicationListModel::Application::Application(
     BackgroundApplicationListModel* model,
     const Extension* extension)
-    : extension_(extension),
-      icon_(NULL),
-      model_(model) {
-}
+    : extension_(extension), model_(model) {}
 
 void BackgroundApplicationListModel::Application::OnImageLoaded(
     const gfx::Image& image) {
   if (image.IsEmpty())
     return;
   icon_.reset(image.CopyImageSkia());
   model_->SendApplicationDataChangedNotifications(extension_);
 }
 
 void BackgroundApplicationListModel::Application::RequestIcon(
@@ skipping 255 matching lines @@
          (*old_cursor)->name() == (*new_cursor)->name() &&
          (*old_cursor)->id() == (*new_cursor)->id()) {
     ++old_cursor;
     ++new_cursor;
   }
   if (old_cursor != extensions_.end() || new_cursor != extensions.end()) {
     extensions_ = extensions;
     FOR_EACH_OBSERVER(Observer, observers_, OnApplicationListChanged(profile_));
   }
 }