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

chrome/browser/chromeos/drive/resource_metadata_unittest.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/chromeos/drive/resource_metadata.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 842 matching lines @@
   scoped_ptr<ResourceEntryVector> entries_in_other =
       ReadDirectoryByPathSync(base::FilePath::FromUTF8Unsafe("drive/other"));
   ASSERT_TRUE(entries_in_other.get());
   EXPECT_TRUE(entries_in_other->empty());
 }
 
 // Tests for methods running on the blocking task runner.
 class ResourceMetadataTest : public testing::Test {
  protected:
   ResourceMetadataTest()
-      : ui_thread_(content::BrowserThread::UI, &message_loop_),
-        resource_metadata_(NULL) {}
+      : ui_thread_(content::BrowserThread::UI, &message_loop_) {}
 
   virtual void SetUp() OVERRIDE {
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
 
     // Use the main thread as the blocking task runner.
     resource_metadata_.reset(new ResourceMetadata(
         temp_dir_.path(), message_loop_.message_loop_proxy()));
 
     FileError error = FILE_ERROR_FAILED;
     resource_metadata_->Initialize(
@@ skipping 212 matching lines @@
     else
       ++directory_count;
   }
 
   EXPECT_EQ(7, file_count);
   EXPECT_EQ(6, directory_count);
 }
 
 }  // namespace internal
 }  // namespace drive