replace NULL->nullptr in src/remoting.

remoting/host/setup/win/auth_code_getter.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 "remoting/host/setup/win/auth_code_getter.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "base/win/scoped_bstr.h"
 #include "base/win/scoped_variant.h"
 #include "remoting/host/setup/oauth_helper.h"
 
 namespace {
 const int kUrlPollIntervalMs = 100;
 }  // namespace remoting
 
 namespace remoting {
 
 AuthCodeGetter::AuthCodeGetter() :
-    browser_(NULL),
+    browser_(nullptr),
     timer_interval_(base::TimeDelta::FromMilliseconds(kUrlPollIntervalMs)) {
 }
 
 AuthCodeGetter::~AuthCodeGetter() {
   KillBrowser();
 }
 
 void AuthCodeGetter::GetAuthCode(
     base::Callback<void(const std::string&)> on_auth_code) {
   if (browser_.get()) {
     on_auth_code.Run("");
     return;
   }
   on_auth_code_ = on_auth_code;
-  HRESULT hr = browser_.CreateInstance(CLSID_InternetExplorer, NULL,
+  HRESULT hr = browser_.CreateInstance(CLSID_InternetExplorer, nullptr,
                                        CLSCTX_LOCAL_SERVER);
   if (FAILED(hr)) {
     on_auth_code_.Run("");
     return;
   }
   base::win::ScopedBstr url(base::UTF8ToWide(
       GetOauthStartUrl(GetDefaultOauthRedirectUrl())).c_str());
   base::win::ScopedVariant empty_variant;
   hr = browser_->Navigate(url, empty_variant.AsInput(), empty_variant.AsInput(),
                           empty_variant.AsInput(), empty_variant.AsInput());
@@ skipping 40 matching lines @@
 }
 
 void AuthCodeGetter::KillBrowser() {
   if (browser_.get()) {
     browser_->Quit();
     browser_.Release();
   }
 }
 
 }  // namespace remoting