Remove PlatformWheelEvent and use WebMouseWheelEvent instead

third_party/WebKit/Source/platform/WebMouseWheelEvent.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/WebMouseWheelEvent.h"
+
+namespace blink {
+
+float WebMouseWheelEvent::deltaXInRootFrame() const {
+  return deltaX / m_frameScale;
+}
+
+float WebMouseWheelEvent::deltaYInRootFrame() const {
+  return deltaY / m_frameScale;
+}
+
+WebMouseWheelEvent WebMouseWheelEvent::flattenTransform() const {
+  WebMouseWheelEvent result = *this;
+  result.deltaX /= result.m_frameScale;
+  result.deltaY /= result.m_frameScale;
+  result.flattenTransformSelf();
+  return result;
+}
+
+}  // namespace blink