Remove PlatformWheelEvent and use WebMouseWheelEvent instead

third_party/WebKit/Source/platform/WebMouseEvent.cpp

+// Copyright 2016 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 "public/platform/WebInputEvent.h"
+
+namespace blink {
+
+WebFloatPoint WebMouseEvent::movementInRootFrame() const {
+  return WebFloatPoint((movementX / m_frameScale), (movementY / m_frameScale));
+}
+
+WebFloatPoint WebMouseEvent::positionInRootFrame() const {
+  return WebFloatPoint((x / m_frameScale) + m_frameTranslate.x,
+                       (y / m_frameScale) + m_frameTranslate.y);
+}
+
+}  // namespace blink