Remove abstract Clone and Cancel methods from MotionEvent

ui/events/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 
 static_library("dom4_keycode_converter") {
   sources = [
     "keycodes/dom4/keycode_converter.cc",
     "keycodes/dom4/keycode_converter.h",
@@ skipping 218 matching lines @@
 source_set("test_support") {
   sources = [
     "test/cocoa_test_event_utils.h",
     "test/cocoa_test_event_utils.mm",
     "test/event_generator.cc",
     "test/event_generator.h",
     "test/events_test_utils.cc",
     "test/events_test_utils.h",
     "test/mock_motion_event.cc",
     "test/mock_motion_event.h",
+    "test/motion_event_test_utils.cc",
+    "test/motion_event_test_utils.h",
     "test/platform_event_waiter.cc",
     "test/platform_event_waiter.h",
     "test/test_event_handler.cc",
     "test/test_event_handler.h",
     "test/test_event_processor.cc",
     "test/test_event_processor.h",
     "test/test_event_target.cc",
     "test/test_event_target.h",
   ]
 
@@ skipping 76 matching lines @@
       "ozone/evdev/touch_event_converter_evdev_unittest.cc",
     ]
   }
 
   if (use_aura) {
     sources += [
       "gestures/gesture_provider_aura_unittest.cc",
     ]
   }
 }