Revert of Don't refcount tracking id -> slot id mapping.

ui/events/win/events_win.cc

Index: ui/events/win/events_win.cc
diff --git a/ui/events/win/events_win.cc b/ui/events/win/events_win.cc
index 58b60500ec51d06dc9151b27e238b32cda202010..ccdb2be7e7bb3ab8a5c3c7688d0ec9640c4639dc 100644
--- a/ui/events/win/events_win.cc
+++ b/ui/events/win/events_win.cc
@@ -299,6 +299,10 @@
 void ReleaseCopiedNativeEvent(const base::NativeEvent& event) {
 }
 
+void IncrementTouchIdRefCount(const base::NativeEvent& event) {
+  NOTIMPLEMENTED();
+}
+
 void ClearTouchIdIfReleased(const base::NativeEvent& xev) {
   NOTIMPLEMENTED();
 }