[Sync] Convert sync to a static library.

components/sync/base/extensions_activity.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 COMPONENTS_SYNC_BASE_EXTENSIONS_ACTIVITY_H_
 #define COMPONENTS_SYNC_BASE_EXTENSIONS_ACTIVITY_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
-#include "components/sync/base/sync_export.h"
 
 namespace syncer {
 
 // A storage to record usage of extensions APIs to send to sync
 // servers, with the ability to purge data once sync servers have
 // acknowledged it (successful commit response).
-class SYNC_EXPORT ExtensionsActivity
+class ExtensionsActivity
     : public base::RefCountedThreadSafe<ExtensionsActivity> {
  public:
   // A data record of activity performed by extension |extension_id|.
-  struct SYNC_EXPORT Record {
+  struct Record {
     Record();
     ~Record();
 
     // The human-readable ID identifying the extension responsible
     // for the activity reported in this Record.
     std::string extension_id;
 
     // How many times the extension successfully invoked a write
     // operation through the bookmarks API since the last CommitMessage.
     uint32_t bookmark_write_count;
@@ skipping 19 matching lines @@
   friend class base::RefCountedThreadSafe<ExtensionsActivity>;
   ~ExtensionsActivity();
 
   Records records_;
   mutable base::Lock records_lock_;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_BASE_EXTENSIONS_ACTIVITY_H_