Cleanup and refactor RootScrollerController.

third_party/WebKit/Source/core/page/scrolling/ChildViewportScrollCallback.cpp

Index: third_party/WebKit/Source/core/page/scrolling/ChildViewportScrollCallback.cpp
diff --git a/third_party/WebKit/Source/core/page/scrolling/ChildViewportScrollCallback.cpp b/third_party/WebKit/Source/core/page/scrolling/ChildViewportScrollCallback.cpp
deleted file mode 100644
index 3ac8d9f1c8f410df7cefe9bed257df559126e1cb..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/page/scrolling/ChildViewportScrollCallback.cpp
+++ /dev/null
@@ -1,44 +0,0 @@
-// 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 "core/page/scrolling/ChildViewportScrollCallback.h"
-
-#include "core/page/scrolling/ScrollState.h"
-#include "platform/geometry/FloatSize.h"
-#include "platform/scroll/ScrollTypes.h"
-#include "platform/scroll/ScrollableArea.h"
-
-namespace blink {
-
-ChildViewportScrollCallback::ChildViewportScrollCallback()
-{
-}
-
-ChildViewportScrollCallback::~ChildViewportScrollCallback()
-{
-}
-
-DEFINE_TRACE(ChildViewportScrollCallback)
-{
-    visitor->trace(m_scroller);
-    ViewportScrollCallback::trace(visitor);
-}
-
-
-void ChildViewportScrollCallback::handleEvent(ScrollState* state)
-{
-    DCHECK(state);
-
-    if (!m_scroller)
-        return;
-
-    performNativeScroll(*state, *m_scroller);
-}
-
-void ChildViewportScrollCallback::setScroller(ScrollableArea* scroller)
-{
-    m_scroller = scroller;
-}
-
-} // namespace blink