replace NULL->nullptr in src/remoting.

remoting/host/pairing_registry_delegate_win.h

 // 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.
 
 #ifndef REMOTING_PROTOCOL_PAIRING_REGISTRY_DELEGATE_WIN_H_
 #define REMOTING_PROTOCOL_PAIRING_REGISTRY_DELEGATE_WIN_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 20 matching lines @@
 const wchar_t kPairingRegistrySecretsKeyName[] = L"secrets";
 
 // Stores client pairing information in Windows registry. Two separate registry
 // keys are used:
 //  - |privileged| - contains the shared secrets of all pairings. This key must
 //                   be protected by a strong ACL denying access to unprivileged
 //                   code.
 //  - |unprivileged| - contains the rest of pairing state.
 //
 // Creator of this object is responsible for passing the registry key handles
-// with appropriate access. |privileged| may be NULL if read-only access is
+// with appropriate access. |privileged| may be nullptr if read-only access is
 // sufficient. Shared secrets will not be returned in such a case.
 class PairingRegistryDelegateWin
     : public protocol::PairingRegistry::Delegate {
  public:
   PairingRegistryDelegateWin();
   virtual ~PairingRegistryDelegateWin();
 
   // Passes the root keys to be used to access the pairing registry store.
-  // |privileged| is optional and may be NULL. The caller retains ownership of
-  // the passed handles.
+  // |privileged| is optional and may be nullptr. The caller retains ownership
+  // of the passed handles.
   bool SetRootKeys(HKEY privileged, HKEY unprivileged);
 
   // PairingRegistry::Delegate interface
   virtual scoped_ptr<base::ListValue> LoadAll() override;
   virtual bool DeleteAll() override;
   virtual protocol::PairingRegistry::Pairing Load(
       const std::string& client_id) override;
   virtual bool Save(const protocol::PairingRegistry::Pairing& pairing) override;
   virtual bool Delete(const std::string& client_id) override;
 
  private:
   base::win::RegKey privileged_;
   base::win::RegKey unprivileged_;
 
   DISALLOW_COPY_AND_ASSIGN(PairingRegistryDelegateWin);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_PAIRING_REGISTRY_DELEGATE_WIN_H_