replace NULL->nullptr in src/remoting.

remoting/host/win/com_security.cc

 // Copyright 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 "remoting/host/win/com_security.h"
 
 #include <objidl.h>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 30 matching lines @@
 
   DWORD capabilities = EOAC_DYNAMIC_CLOAKING;
   if (!activate_as_activator)
     capabilities |= EOAC_DISABLE_AAA;
 
   // Apply the security descriptor and default security settings. See
   // InitializeComSecurity's declaration for details.
   HRESULT result = CoInitializeSecurity(
       absolute_sd.get(),
       -1,       // Let COM choose which authentication services to register.
-      NULL,     // See above.
-      NULL,     // Reserved, must be NULL.
+      nullptr,     // See above.
+      nullptr,     // Reserved, must be nullptr.
       RPC_C_AUTHN_LEVEL_PKT_PRIVACY,
       RPC_C_IMP_LEVEL_IDENTIFY,
-      NULL,     // Default authentication information is not provided.
+      nullptr,     // Default authentication information is not provided.
       capabilities,
-      NULL);    /// Reserved, must be NULL
+      nullptr);    /// Reserved, must be nullptr
   if (FAILED(result)) {
     LOG(ERROR) << "CoInitializeSecurity() failed, result=0x"
                << std::hex << result << std::dec << ".";
     return false;
   }
 
   return true;
 }
 
 } // namespace remoting