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

chrome/browser/custom_handlers/protocol_handler_registry_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/custom_handlers/protocol_handler_registry.h"
 
 #include <set>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
@@ skipping 68 matching lines @@
 };
 
 void AssertWillHandleIO(
     const std::string& scheme,
     bool expected,
     ProtocolHandlerRegistry::JobInterceptorFactory* interceptor) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   interceptor->Chain(scoped_ptr<net::URLRequestJobFactory>(
       new FakeURLRequestJobFactory()));
   ASSERT_EQ(expected, interceptor->IsHandledProtocol(scheme));
-  interceptor->Chain(scoped_ptr<net::URLRequestJobFactory>(NULL));
+  interceptor->Chain(scoped_ptr<net::URLRequestJobFactory>());
 }
 
 void AssertWillHandle(
     const std::string& scheme,
     bool expected,
     ProtocolHandlerRegistry::JobInterceptorFactory* interceptor) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   BrowserThread::PostTask(BrowserThread::IO,
                           FROM_HERE,
                           base::Bind(AssertWillHandleIO,
@@ skipping 816 matching lines @@
 
 TEST_F(ProtocolHandlerRegistryTest, MAYBE_TestInstallDefaultHandler) {
   RecreateRegistry(false);
   registry()->AddPredefinedHandler(CreateProtocolHandler(
       "test", GURL("http://test.com/%s"), "Test"));
   registry()->InitProtocolSettings();
   std::vector<std::string> protocols;
   registry()->GetRegisteredProtocols(&protocols);
   ASSERT_EQ(static_cast<size_t>(1), protocols.size());
 }