[Sync] Convert sync to a static library.

components/sync/js/js_controller.h

Index: components/sync/js/js_controller.h
diff --git a/components/sync/js/js_controller.h b/components/sync/js/js_controller.h
index 7daa263d9105c2f8ea4bca98d8f63f5dca1bf81a..ad991a5e634225baf479d9d44efcc2541b7b0536 100644
--- a/components/sync/js/js_controller.h
+++ b/components/sync/js/js_controller.h
@@ -9,8 +9,6 @@
 
 #include <string>
 
-#include "components/sync/base/sync_export.h"
-
 namespace syncer {
 
 class JsEventHandler;
@@ -20,7 +18,7 @@ class WeakHandle;
 // An interface for objects that JsEventHandlers directly interact
 // with.  JsEventHandlers can add themselves to receive events and
 // also send messages which will eventually reach the backend.
-class SYNC_EXPORT JsController {
+class JsController {
  public:
   // Adds an event handler which will start receiving JS events (not
   // immediately, so this can be called in the handler's constructor).