Fabric: Removed obsolete type definition in EventEmitter

Summary: We merge `events` module into `core` long time ago, so we don't need this anymore.

Reviewed By: mdvacca

Differential Revision: D17142174

fbshipit-source-id: 6e63f7f22dc3d65ed2f9cc3bd4f4776404dfe788

ReactCommon/fabric/core/events/EventEmitter.h

@@ -13,6 +13,7 @@
 #include <react/core/EventDispatcher.h>
 #include <react/core/EventPriority.h>
 #include <react/core/EventTarget.h>
+#include <react/core/ReactPrimitives.h>
 
 namespace facebook {
 namespace react {
@@ -28,12 +29,6 @@ using SharedEventEmitter = std::shared_ptr<const EventEmitter>;
  * event.
  */
 class EventEmitter {
-  /*
-   * We have to repeat `Tag` type definition here because `events` module does
-   * not depend on `core` module (and should not).
-   */
-  using Tag = int32_t;
-
  public:
   using Shared = std::shared_ptr<EventEmitter const>;