[Sync] Convert sync to a static library.

components/sync/core/simple_metadata_change_list.h

Index: components/sync/core/simple_metadata_change_list.h
diff --git a/components/sync/core/simple_metadata_change_list.h b/components/sync/core/simple_metadata_change_list.h
index 8a130c20db11dc5e5f3b200533e7adf233d46179..f04562af0445c26ae8a81f6e5cde3023d99081fa 100644
--- a/components/sync/core/simple_metadata_change_list.h
+++ b/components/sync/core/simple_metadata_change_list.h
@@ -10,7 +10,6 @@
 
 #include "components/sync/api/metadata_change_list.h"
 #include "components/sync/api/model_type_store.h"
-#include "components/sync/base/sync_export.h"
 #include "components/sync/core/non_blocking_sync_common.h"
 #include "components/sync/protocol/data_type_state.pb.h"
 #include "components/sync/protocol/entity_metadata.pb.h"
@@ -20,7 +19,7 @@ namespace syncer_v2 {
 // A MetadataChangeList implementation that is meant to be used in combination
 // with a ModelTypeStore. It accumulates changes in member fields, and then when
 // requested transfers them to the store/write batch.
-class SYNC_EXPORT SimpleMetadataChangeList : public MetadataChangeList {
+class SimpleMetadataChangeList : public MetadataChangeList {
  public:
   enum ChangeType { UPDATE, CLEAR };