Reland "Don't refcount tracking id -> slot id mapping."

ui/events/event_utils.h

Index: ui/events/event_utils.h
diff --git a/ui/events/event_utils.h b/ui/events/event_utils.h
index 2a0e699c28f8ccb02a16a6d213e68cc3274f745f..1649bd7eed5364c931f590f472896035eedf6391 100644
--- a/ui/events/event_utils.h
+++ b/ui/events/event_utils.h
@@ -116,11 +116,6 @@ void ReleaseCopiedNativeEvent(
 // Gets the touch id from a native event.
 EVENTS_EXPORT int GetTouchId(const base::NativeEvent& native_event);
 
-// Increases the number of times |ClearTouchIdIfReleased| needs to be called on
-// an event with a given touch id before it will actually be cleared.
-EVENTS_EXPORT void IncrementTouchIdRefCount(
-    const base::NativeEvent& native_event);
-
 // Clear the touch id from bookkeeping if it is a release/cancel event.
 EVENTS_EXPORT void ClearTouchIdIfReleased(
     const base::NativeEvent& native_event);