add missing headers in ppapi/*

ppapi/proxy/handle_converter.cc

 // Copyright (c) 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 "ppapi/proxy/handle_converter.h"
 
 #include <vector>
+#include "base/bind.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_message_macros.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/resource_message_params.h"
 #include "ppapi/proxy/serialized_handle.h"
 #include "ppapi/proxy/serialized_var.h"
 
 class NaClDescImcShm;
 
 namespace IPC {
@@ skipping 257 matching lines @@
   DCHECK(msg.is_sync());
 
   int msg_id = IPC::SyncMessage::GetMessageId(msg);
   DCHECK(pending_sync_msgs_.find(msg_id) == pending_sync_msgs_.end());
 
   pending_sync_msgs_[msg_id] = msg.type();
 }
 
 }  // namespace proxy
 }  // namespace ppapi