[Sync] Convert sync to a static library.

components/sync/engine_impl/clear_server_data.h

Index: components/sync/engine_impl/clear_server_data.h
diff --git a/components/sync/engine_impl/clear_server_data.h b/components/sync/engine_impl/clear_server_data.h
index f0e11ba959dd8bc430420212171c86d20308c084..74f57aa02626ae50a1a25fef9ceddaaec1335953 100644
--- a/components/sync/engine_impl/clear_server_data.h
+++ b/components/sync/engine_impl/clear_server_data.h
@@ -7,7 +7,6 @@
 
 #include <string>
 
-#include "components/sync/base/sync_export.h"
 #include "components/sync/base/syncer_error.h"
 #include "components/sync/protocol/sync.pb.h"
 
@@ -22,7 +21,7 @@ class SyncSession;
 // An instance of this class corresponds to a single operation and is
 // responsible for building a request, sending it, and interpreting the
 // response.
-class SYNC_EXPORT ClearServerData {
+class ClearServerData {
  public:
   explicit ClearServerData(const std::string& account_name);
   ~ClearServerData();