Switch to standard integer types in gpu/.

gpu/command_buffer/service/mailbox_manager_impl.cc

 // 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.
 
 #include "gpu/command_buffer/service/mailbox_manager_impl.h"
 
+#include <stddef.h>
+
 #include <algorithm>
 
 #include "gpu/command_buffer/service/texture_manager.h"
 
 namespace gpu {
 namespace gles2 {
 
 MailboxManagerImpl::MailboxManagerImpl() {
 }
 
@@ skipping 45 matching lines @@
        it != range.second; ++it) {
     size_t count = mailbox_to_textures_.erase(it->second);
     DCHECK(count == 1);
   }
   textures_to_mailboxes_.erase(range.first, range.second);
   DCHECK_EQ(mailbox_to_textures_.size(), textures_to_mailboxes_.size());
 }
 
 }  // namespace gles2
 }  // namespace gpu