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

chrome/browser/safe_browsing/safe_browsing_database.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/safe_browsing/safe_browsing_database.h"
 
 #include <algorithm>
 #include <iterator>
 
 #include "base/bind.h"
@@ skipping 422 matching lines @@
 
 // static
 void SafeBrowsingDatabase::RecordFailure(FailureType failure_type) {
   UMA_HISTOGRAM_ENUMERATION("SB2.DatabaseFailure", failure_type,
                             FAILURE_DATABASE_MAX);
 }
 
 SafeBrowsingDatabaseNew::SafeBrowsingDatabaseNew()
     : creation_loop_(base::MessageLoop::current()),
       browse_store_(new SafeBrowsingStoreFile),
-      download_store_(NULL),
-      csd_whitelist_store_(NULL),
-      download_whitelist_store_(NULL),
       reset_factory_(this),
       corruption_detected_(false),
       change_detected_(false) {
   DCHECK(browse_store_.get());
   DCHECK(!download_store_.get());
   DCHECK(!csd_whitelist_store_.get());
   DCHECK(!download_whitelist_store_.get());
   DCHECK(!extension_blacklist_store_.get());
   DCHECK(!side_effect_free_whitelist_store_.get());
 }
@@ skipping 1145 matching lines @@
   if (std::binary_search(new_whitelist.begin(), new_whitelist.end(),
                          kill_switch)) {
     // The kill switch is whitelisted hence we whitelist all URLs.
     WhitelistEverything(whitelist);
   } else {
     base::AutoLock locked(lookup_lock_);
     whitelist->second = false;
     whitelist->first.swap(new_whitelist);
   }
 }