Remove stl_util's STLElementDeleter from sync.

components/sync/core_impl/protocol_event_buffer.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 COMPONENTS_SYNC_CORE_IMPL_PROTOCOL_EVENT_BUFFER_H_
 #define COMPONENTS_SYNC_CORE_IMPL_PROTOCOL_EVENT_BUFFER_H_
 
 #include <stddef.h>
 
 #include <deque>
+#include <memory>
+#include <vector>
 
 #include "base/macros.h"
-#include "base/memory/scoped_vector.h"
 
 namespace syncer {
 
 class ProtocolEvent;
 
 // A container for ProtocolEvents.
 //
 // Stores at most kBufferSize events, then starts dropping the oldest events.
 class ProtocolEventBuffer {
  public:
   static const size_t kBufferSize;
 
   ProtocolEventBuffer();
   ~ProtocolEventBuffer();
 
   // Records an event.  May cause the oldest event to be dropped.
   void RecordProtocolEvent(const ProtocolEvent& event);
 
-  // Returns the buffered contents.  Will not clear the buffer.
-  ScopedVector<ProtocolEvent> GetBufferedProtocolEvents() const;
+  // Returns copies of the buffered contents.  Will not clear the buffer.
+  std::vector<std::unique_ptr<ProtocolEvent>> GetBufferedProtocolEvents() const;
 
  private:
-  std::deque<ProtocolEvent*> buffer_;
-  base::STLElementDeleter<std::deque<ProtocolEvent*>> buffer_deleter_;
+  std::deque<std::unique_ptr<ProtocolEvent>> buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(ProtocolEventBuffer);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_CORE_IMPL_PROTOCOL_EVENT_BUFFER_H_