Replace NULL with nullptr.

extensions/browser/api/cast_channel/cast_channel_api.cc

 // Copyright 2014 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 "extensions/browser/api/cast_channel/cast_channel_api.h"
 
 #include <limits>
 #include <string>
 
 #include "base/json/json_writer.h"
@@ skipping 131 matching lines @@
 scoped_ptr<CastSocket> CastChannelAPI::GetSocketForTest() {
   return socket_for_test_.Pass();
 }
 
 content::BrowserContext* CastChannelAPI::GetBrowserContext() const {
   return browser_context_;
 }
 
 CastChannelAPI::~CastChannelAPI() {}
 
-CastChannelAsyncApiFunction::CastChannelAsyncApiFunction() : manager_(NULL) {
+CastChannelAsyncApiFunction::CastChannelAsyncApiFunction() : manager_(nullptr) {
 }
 
 CastChannelAsyncApiFunction::~CastChannelAsyncApiFunction() { }
 
 bool CastChannelAsyncApiFunction::PrePrepare() {
   manager_ = ApiResourceManager<CastSocket>::Get(browser_context());
   return true;
 }
 
 bool CastChannelAsyncApiFunction::Respond() {
@@ skipping 399 matching lines @@
   std::string& signature = params_->signature;
   if (signature.empty() || keys.empty() ||
       !cast_channel::SetTrustedCertificateAuthorities(keys, signature)) {
     SetError("Unable to set authority keys.");
   }
 
   AsyncWorkCompleted();
 }
 
 }  // namespace extensions