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

chrome/browser/chromeos/login/login_browsertest.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 "ash/shell.h"
 #include "base/command_line.h"
 #include "chrome/browser/chrome_browser_main.h"
 #include "chrome/browser/chrome_browser_main_extra_parts.h"
 #include "chrome/browser/chrome_content_browser_client.h"
 #include "chrome/browser/chromeos/cros/cros_in_process_browser_test.h"
@@ skipping 18 matching lines @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 using ::testing::_;
 using ::testing::AnyNumber;
 using ::testing::Return;
 
 namespace {
 
 class LoginTestBase : public chromeos::CrosInProcessBrowserTest {
  public:
-  LoginTestBase()
-    : mock_cryptohome_library_(NULL) {
-  }
+  LoginTestBase() {}
 
  protected:
   virtual void SetUpInProcessBrowserTestFixture() OVERRIDE {
     mock_cryptohome_library_.reset(new chromeos::MockCryptohomeLibrary());
     cros_mock_->InitStatusAreaMocks();
     cros_mock_->SetStatusAreaMocksExpectations();
     EXPECT_CALL(*(mock_cryptohome_library_.get()), GetSystemSalt())
         .WillRepeatedly(Return(std::string("stub_system_salt")));
     EXPECT_CALL(*(mock_cryptohome_library_.get()), InstallAttributesIsReady())
         .WillRepeatedly(Return(false));
@@ skipping 156 matching lines @@
 // Verifies that the webui for login comes up successfully.
 IN_PROC_BROWSER_TEST_F(LoginSigninTest, WebUIVisible) {
   scoped_refptr<content::MessageLoopRunner> runner =
       new content::MessageLoopRunner;
   content_browser_client_->browser_main_extra_parts_->set_quit_task(
       runner->QuitClosure());
   runner->Run();
 }
 
 }