Rectify our use of std::nullptr_t, inclusions of <stddef.h>/<cstddef>.

mojo/public/cpp/bindings/interface_request.h

 // 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.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_REQUEST_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_REQUEST_H_
 
+#include <cstddef>
+
 #include "mojo/public/cpp/system/message_pipe.h"
 
 namespace mojo {
 
 template <typename I>
 class InterfacePtr;
 
 template <typename I>
 class InterfacePtrInfo;
 
 // Represents a request from a remote client for an implementation of Interface
 // over a specified message pipe. The implementor of the interface should
 // remove the message pipe by calling PassMessagePipe() and bind it to the
 // implementation. If this is not done, the InterfaceRequest will automatically
 // close the pipe on destruction. Can also represent the absence of a request
 // if the client did not provide a message pipe.
 template <typename Interface>
 class InterfaceRequest {
  public:
   // Constructs an empty InterfaceRequest, representing that the client is not
   // requesting an implementation of Interface.
   InterfaceRequest() {}
-  InterfaceRequest(decltype(nullptr)) {}
+  InterfaceRequest(std::nullptr_t) {}
 
   // Takes the message pipe from another InterfaceRequest.
   InterfaceRequest(InterfaceRequest&& other) { handle_ = other.handle_.Pass(); }
   InterfaceRequest& operator=(InterfaceRequest&& other) {
     handle_ = other.handle_.Pass();
     return *this;
   }
 
   // Assigning to nullptr resets the InterfaceRequest to an empty state,
   // closing the message pipe currently bound to it (if any).
-  InterfaceRequest& operator=(decltype(nullptr)) {
+  InterfaceRequest& operator=(std::nullptr_t) {
     handle_.reset();
     return *this;
   }
 
   // Binds the request to a message pipe over which Interface is to be
   // requested.  If the request is already bound to a message pipe, the current
   // message pipe will be closed.
   void Bind(ScopedMessagePipeHandle handle) { handle_ = handle.Pass(); }
 
   // Indicates whether the request currently contains a valid message pipe.
@@ skipping 64 matching lines @@
 template <typename Interface>
 InterfaceRequest<Interface> GetProxy(InterfacePtr<Interface>* ptr) {
   MessagePipe pipe;
   ptr->Bind(InterfacePtrInfo<Interface>(pipe.handle0.Pass(), 0u));
   return MakeRequest<Interface>(pipe.handle1.Pass());
 }
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_REQUEST_H_