EDK: Convert remaining scoped_ptr -> std::unique_ptr in //mojo/edk/system.

mojo/edk/system/local_message_pipe_endpoint.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 MOJO_EDK_SYSTEM_LOCAL_MESSAGE_PIPE_ENDPOINT_H_
 #define MOJO_EDK_SYSTEM_LOCAL_MESSAGE_PIPE_ENDPOINT_H_
 
 #include "mojo/edk/system/awakable_list.h"
 #include "mojo/edk/system/handle_signals_state.h"
 #include "mojo/edk/system/message_in_transit_queue.h"
 #include "mojo/edk/system/message_pipe_endpoint.h"
 #include "mojo/edk/system/system_impl_export.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
 namespace system {
 
 class MOJO_SYSTEM_IMPL_EXPORT LocalMessagePipeEndpoint final
     : public MessagePipeEndpoint {
  public:
   // If |message_queue| is non-null, its contents will be taken as the queue of
   // (already-received) messages.
   explicit LocalMessagePipeEndpoint(
       MessageInTransitQueue* message_queue = nullptr);
   ~LocalMessagePipeEndpoint() override;
 
   // |MessagePipeEndpoint| implementation:
   Type GetType() const override;
   bool OnPeerClose() override;
-  void EnqueueMessage(scoped_ptr<MessageInTransit> message) override;
+  void EnqueueMessage(std::unique_ptr<MessageInTransit> message) override;
 
   // There's a dispatcher for |LocalMessagePipeEndpoint|s, so we have to
   // implement/override these:
   void Close() override;
   void CancelAllAwakables() override;
   MojoResult ReadMessage(UserPointer<void> bytes,
                          UserPointer<uint32_t> num_bytes,
                          DispatcherVector* dispatchers,
                          uint32_t* num_dispatchers,
                          MojoReadMessageFlags flags) override;
@@ skipping 16 matching lines @@
   MessageInTransitQueue message_queue_;
   AwakableList awakable_list_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(LocalMessagePipeEndpoint);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_LOCAL_MESSAGE_PIPE_ENDPOINT_H_