Revert of Add POINTER_TYPE_ERASER to EventPointerType

ui/events/gestures/motion_event_aura.cc

 // Copyright 2014 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 "ui/events/gestures/motion_event_aura.h"
 
 #include "base/logging.h"
 #include "ui/events/gesture_detection/gesture_configuration.h"
 
 namespace ui {
 namespace {
 
 MotionEvent::ToolType EventPointerTypeToMotionEventToolType(
     EventPointerType type) {
   switch (type) {
     case EventPointerType::POINTER_TYPE_UNKNOWN:
       return MotionEvent::TOOL_TYPE_UNKNOWN;
     case EventPointerType::POINTER_TYPE_MOUSE:
       return MotionEvent::TOOL_TYPE_MOUSE;
     case EventPointerType::POINTER_TYPE_PEN:
       return MotionEvent::TOOL_TYPE_STYLUS;
     case EventPointerType::POINTER_TYPE_TOUCH:
       return MotionEvent::TOOL_TYPE_FINGER;
-    case EventPointerType::POINTER_TYPE_ERASER:
-      return MotionEvent::TOOL_TYPE_ERASER;
   }
 
   return MotionEvent::TOOL_TYPE_UNKNOWN;
 }
 
 PointerProperties GetPointerPropertiesFromTouchEvent(const TouchEvent& touch) {
   PointerProperties pointer_properties;
   pointer_properties.x = touch.x();
   pointer_properties.y = touch.y();
   pointer_properties.raw_x = touch.root_location_f().x();
@@ skipping 135 matching lines @@
 
 int MotionEventAura::GetIndexFromId(int id) const {
   int index = FindPointerIndexOfId(id);
   // TODO(tdresser): remove these checks once crbug.com/525189 is fixed.
   CHECK_GE(index, 0);
   CHECK_LT(index, static_cast<int>(GetPointerCount()));
   return index;
 }
 
 }  // namespace ui