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

chrome/browser/safe_browsing/safe_browsing_store_file.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_store_file.h"
 
 #include "base/md5.h"
 #include "base/metrics/histogram.h"
 
 namespace {
@@ skipping 183 matching lines @@
 
     // Just best-effort on the journal file, don't want to get lost in
     // the weeds.
     const base::FilePath journal_filename(
         current_filename.DirName().AppendASCII("Safe Browsing-journal"));
     file_util::Delete(journal_filename, false);
   }
 }
 
 SafeBrowsingStoreFile::SafeBrowsingStoreFile()
-    : chunks_written_(0),
-      file_(NULL),
-      empty_(false),
-      corruption_seen_(false) {
-}
+    : chunks_written_(0), empty_(false), corruption_seen_(false) {}
 
 SafeBrowsingStoreFile::~SafeBrowsingStoreFile() {
   Close();
 }
 
 bool SafeBrowsingStoreFile::Delete() {
   // The database should not be open at this point.  But, just in
   // case, close everything before deleting.
   if (!Close()) {
     NOTREACHED();
@@ skipping 536 matching lines @@
   // With SQLite support gone, one way to get to this code is if the
   // existing file is a SQLite file.  Make sure the journal file is
   // also removed.
   const base::FilePath journal_filename(
       basename.value() + FILE_PATH_LITERAL("-journal"));
   if (file_util::PathExists(journal_filename))
     file_util::Delete(journal_filename, false);
 
   return true;
 }