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

chrome/browser/sync_file_system/drive_file_sync_service_unittest.cc

 // Copyright (c) 2013 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/sync_file_system/drive_file_sync_service.h"
 
 #include "base/message_loop.h"
 #include "chrome/browser/sync_file_system/drive/fake_api_util.h"
 #include "chrome/browser/sync_file_system/drive_metadata_store.h"
 #include "chrome/browser/sync_file_system/sync_file_system.pb.h"
@@ skipping 26 matching lines @@
 }
 
 }  // namespace
 
 class DriveFileSyncServiceTest : public testing::Test {
  public:
   DriveFileSyncServiceTest()
       : ui_thread_(content::BrowserThread::UI, &message_loop_),
         file_thread_(content::BrowserThread::FILE, &message_loop_),
         fake_api_util_(NULL),
-        metadata_store_(NULL),
-        sync_service_(NULL) {}
+        metadata_store_(NULL) {}
 
   virtual void SetUp() OVERRIDE {
     RegisterSyncableFileSystem();
     fake_api_util_ = new drive::FakeAPIUtil;
 
     ASSERT_TRUE(scoped_base_dir_.CreateUniqueTempDir());
     base_dir_ = scoped_base_dir_.path();
     metadata_store_ = new DriveMetadataStore(
         base_dir_, base::MessageLoopProxy::current().get());
     bool done = false;
@@ skipping 184 matching lines @@
   ASSERT_EQ(6u, origin_status_map.size());
   EXPECT_EQ("Pending", origin_status_map[GURL("chrome-extension://app_p0")]);
   EXPECT_EQ("Pending", origin_status_map[GURL("chrome-extension://app_p1")]);
   EXPECT_EQ("Pending", origin_status_map[GURL("chrome-extension://app_p2")]);
   EXPECT_EQ("Enabled", origin_status_map[GURL("chrome-extension://app_e0")]);
   EXPECT_EQ("Enabled", origin_status_map[GURL("chrome-extension://app_e1")]);
   EXPECT_EQ("Disabled", origin_status_map[GURL("chrome-extension://app_d0")]);
 }
 
 }  // namespace sync_file_system