[Sync] Convert sync to a static library.

components/sync/engine_impl/syncer_util.h

Index: components/sync/engine_impl/syncer_util.h
diff --git a/components/sync/engine_impl/syncer_util.h b/components/sync/engine_impl/syncer_util.h
index 5c4d10ca20562fdb431d23c10f5fa12a35e0b7f0..42abcb1b7a175a3e75fa58b87d2746c83109484d 100644
--- a/components/sync/engine_impl/syncer_util.h
+++ b/components/sync/engine_impl/syncer_util.h
@@ -14,7 +14,6 @@
 #include <string>
 #include <vector>
 
-#include "components/sync/base/sync_export.h"
 #include "components/sync/engine_impl/syncer.h"
 #include "components/sync/engine_impl/syncer_types.h"
 #include "components/sync/syncable/entry_kernel.h"
@@ -60,16 +59,15 @@ UpdateAttemptResponse AttemptToUpdateEntry(
 //
 // Will return an invalid position if no valid position can be constructed, or
 // if this type does not support positioning.
-SYNC_EXPORT UniquePosition GetUpdatePosition(const sync_pb::SyncEntity& update,
-                                             const std::string& suffix);
+UniquePosition GetUpdatePosition(const sync_pb::SyncEntity& update,
+                                 const std::string& suffix);
 
 // Fetch the cache_guid and item_id-based unique bookmark tag from an update.
 // Will return an empty string if someting unexpected happens.
-SYNC_EXPORT std::string GetUniqueBookmarkTagFromUpdate(
-    const sync_pb::SyncEntity& update);
+std::string GetUniqueBookmarkTagFromUpdate(const sync_pb::SyncEntity& update);
 
 // Pass in name to avoid redundant UTF8 conversion.
-SYNC_EXPORT void UpdateServerFieldsFromUpdate(
+void UpdateServerFieldsFromUpdate(
     syncable::ModelNeutralMutableEntry* local_entry,
     const sync_pb::SyncEntity& server_entry,
     const std::string& name);