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

chrome/browser/google_apis/gdata_wapi_parser.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/google_apis/gdata_wapi_parser.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 823 matching lines @@
 
 // static
 scoped_ptr<ResourceList> ResourceList::ExtractAndParse(
     const base::Value& value) {
   const base::DictionaryValue* as_dict = NULL;
   const base::DictionaryValue* feed_dict = NULL;
   if (value.GetAsDictionary(&as_dict) &&
       as_dict->GetDictionary(kFeedField, &feed_dict)) {
     return ResourceList::CreateFrom(*feed_dict);
   }
-  return scoped_ptr<ResourceList>(NULL);
+  return scoped_ptr<ResourceList>();
 }
 
 // static
 scoped_ptr<ResourceList> ResourceList::CreateFrom(const base::Value& value) {
   scoped_ptr<ResourceList> feed(new ResourceList());
   if (!feed->Parse(value)) {
     DVLOG(1) << "Invalid resource list!";
-    return scoped_ptr<ResourceList>(NULL);
+    return scoped_ptr<ResourceList>();
   }
 
   return feed.Pass();
 }
 
 // static
 scoped_ptr<ResourceList> ResourceList::CreateFromChangeList(
     const ChangeList& changelist) {
   scoped_ptr<ResourceList> feed(new ResourceList());
   int64 largest_changestamp = 0;
@@ skipping 169 matching lines @@
 // static
 scoped_ptr<AccountMetadata> AccountMetadata::CreateFrom(
     const base::Value& value) {
   scoped_ptr<AccountMetadata> metadata(new AccountMetadata());
   const base::DictionaryValue* dictionary = NULL;
   const base::Value* entry = NULL;
   if (!value.GetAsDictionary(&dictionary) ||
       !dictionary->Get(kEntryField, &entry) ||
       !metadata->Parse(*entry)) {
     LOG(ERROR) << "Unable to create: Invalid account metadata feed!";
-    return scoped_ptr<AccountMetadata>(NULL);
+    return scoped_ptr<AccountMetadata>();
   }
 
   return metadata.Pass();
 }
 
 bool AccountMetadata::Parse(const base::Value& value) {
   base::JSONValueConverter<AccountMetadata> converter;
   if (!converter.Convert(value, this)) {
     LOG(ERROR) << "Unable to parse: Invalid account metadata feed!";
     return false;
   }
   return true;
 }
 
 }  // namespace google_apis