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

ui/events/events_stub.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/logging.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/keycodes/dom3/dom_code.h"
 #include "ui/gfx/geometry/point.h"
@@ skipping 52 matching lines @@
 
 base::NativeEvent CopyNativeEvent(const base::NativeEvent& event) {
   NOTIMPLEMENTED() <<
       "Don't know how to copy base::NativeEvent for this platform";
   return NULL;
 }
 
 void ReleaseCopiedNativeEvent(const base::NativeEvent& event) {
 }
 
+void IncrementTouchIdRefCount(const base::NativeEvent& native_event) {
+  NOTIMPLEMENTED();
+}
+
 void ClearTouchIdIfReleased(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
 }
 
 int GetTouchId(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
   return 0;
 }
 
 float GetTouchRadiusX(const base::NativeEvent& native_event) {
@@ skipping 66 matching lines @@
   return 0;
 }
 
 uint16 UnmodifiedTextFromNative(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
   return 0;
 }
 
 
 }  // namespace ui