Revert of Disable scrollbar snapback on desktop Linux

content/renderer/webscrollbarbehavior_impl_aura.h

Index: content/renderer/webscrollbarbehavior_impl_aura.h
diff --git a/content/renderer/webscrollbarbehavior_impl_aura.h b/content/renderer/webscrollbarbehavior_impl_aura.h
deleted file mode 100644
index 0da29e29eca823048bceeb71ead7f70242f26f27..0000000000000000000000000000000000000000
--- a/content/renderer/webscrollbarbehavior_impl_aura.h
+++ /dev/null
@@ -1,24 +0,0 @@
-// 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.
-
-#ifndef CONTENT_RENDERER_WEBSCROLLBARBEHAVIOR_IMPL_AURA_H_
-#define CONTENT_RENDERER_WEBSCROLLBARBEHAVIOR_IMPL_AURA_H_
-
-#include "third_party/WebKit/public/platform/WebScrollbarBehavior.h"
-
-namespace content {
-
-class WebScrollbarBehaviorImpl : public blink::WebScrollbarBehavior {
- public:
-  bool shouldCenterOnThumb(blink::WebPointerProperties::Button mouseButton,
-                           bool shiftKeyPressed,
-                           bool altKeyPressed) override;
-  bool shouldSnapBackToDragOrigin(const blink::WebPoint& eventPoint,
-                                  const blink::WebRect& scrollbarRect,
-                                  bool isHorizontal) override;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_WEBSCROLLBARBEHAVIOR_IMPL_AURA_H_