[Sync] Convert sync to a static library.

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 "base/macros.h"
 #include "base/memory/scoped_vector.h"
-#include "components/sync/base/sync_export.h"
 
 namespace syncer {
 
 class ProtocolEvent;
 
 // A container for ProtocolEvents.
 //
 // Stores at most kBufferSize events, then starts dropping the oldest events.
-class SYNC_EXPORT ProtocolEventBuffer {
+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;
 
  private:
   std::deque<ProtocolEvent*> buffer_;
   STLElementDeleter<std::deque<ProtocolEvent*>> buffer_deleter_;
 
   DISALLOW_COPY_AND_ASSIGN(ProtocolEventBuffer);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_CORE_IMPL_PROTOCOL_EVENT_BUFFER_H_