Switch to standard integer types in ipc/.

ipc/placeholder_brokerable_attachment.h

 // Copyright 2015 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 IPC_PLACEHOLDER_BROKERABLE_ATTACHMENT_H_
 #define IPC_PLACEHOLDER_BROKERABLE_ATTACHMENT_H_
 
+#include "base/macros.h"
 #include "ipc/brokerable_attachment.h"
 #include "ipc/ipc_export.h"
 
 namespace IPC {
 
 // This subclass of BrokerableAttachment has an AttachmentId, and nothing else.
 // It is intended to be replaced by the attachment broker.
 class IPC_EXPORT PlaceholderBrokerableAttachment : public BrokerableAttachment {
  public:
   PlaceholderBrokerableAttachment(const AttachmentId& id)
       : BrokerableAttachment(id){};
   BrokerableType GetBrokerableType() const override;
 
  protected:
   ~PlaceholderBrokerableAttachment() override{};
   DISALLOW_COPY_AND_ASSIGN(PlaceholderBrokerableAttachment);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_PLACEHOLDER_BROKERABLE_ATTACHMENT_H_