Media Controls: Fix time updates when dragging from track not scrubber

third_party/WebKit/Source/core/layout/api/LayoutSliderItem.h

-
-// 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.
-
-#ifndef LayoutSliderItem_h
-#define LayoutSliderItem_h
-
-#include "core/layout/LayoutSlider.h"
-#include "core/layout/api/LayoutBlockItem.h"
-
-namespace blink {
-
-class LayoutSliderItem : public LayoutBlockItem {
- public:
-  explicit LayoutSliderItem(LayoutSlider* layoutSlider)
-      : LayoutBlockItem(layoutSlider) {}
-
-  explicit LayoutSliderItem(const LayoutBlockItem& item)
-      : LayoutBlockItem(item) {
-    SECURITY_DCHECK(!item || item.isSlider());
-  }
-
-  explicit LayoutSliderItem(std::nullptr_t) : LayoutBlockItem(nullptr) {}
-
-  LayoutSliderItem() {}
-
-  bool inDragMode() const { return toSlider()->inDragMode(); }
-
- private:
-  LayoutSlider* toSlider() { return toLayoutSlider(layoutObject()); }
-  const LayoutSlider* toSlider() const {
-    return toLayoutSlider(layoutObject());
-  }
-};
-
-}  // namespace blink
-
-#endif  // LayoutSliderItem_h