Remove parts of //cc we aren't using

cc/input/layer_scroll_offset_delegate.h

-// Copyright 2013 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 CC_INPUT_LAYER_SCROLL_OFFSET_DELEGATE_H_
-#define CC_INPUT_LAYER_SCROLL_OFFSET_DELEGATE_H_
-
-#include "base/basictypes.h"
-#include "ui/gfx/geometry/scroll_offset.h"
-#include "ui/gfx/geometry/size_f.h"
-
-namespace cc {
-
-// The LayerScrollOffsetDelegate allows for the embedder to take ownership of
-// the scroll offset of the root layer.
-//
-// The LayerScrollOffsetDelegate is only used on the impl thread.
-class LayerScrollOffsetDelegate {
- public:
-  // This is called by the compositor to query the current scroll offset of the
-  // layer.
-  // There is no requirement that the return values of this method are
-  // stable in time (two subsequent calls may yield different results).
-  // The return value is not required to be related to the values passed in to
-  // the SetTotalScrollOffset method in any way however it is required to be no
-  // more than the value passed to the most recent SetMaxScrollOffset call.
-  virtual gfx::ScrollOffset GetTotalScrollOffset() = 0;
-
-  // This is called by the compositor to notify the delegate of any change to
-  // the following parameters:
-  // |total_scroll_offset| current scroll offset of the root layer,
-  // |max_scroll_offset| total scroll offset upper bound for the root layer,
-  // |scrollable_size| root layer scrollable size,
-  // |page_scale_factor| current page scale,
-  // |min_page_scale_factor| page scale lower limit,
-  // |max_page_scale_factor| page scale upper limit.
-  virtual void UpdateRootLayerState(
-      const gfx::ScrollOffset& total_scroll_offset,
-      const gfx::ScrollOffset& max_scroll_offset,
-      const gfx::SizeF& scrollable_size,
-      float page_scale_factor,
-      float min_page_scale_factor,
-      float max_page_scale_factor) = 0;
-
-  // This is called by the compositor to check whether a delegate-managed fling
-  // is active or not.
-  virtual bool IsExternalFlingActive() const = 0;
-
- protected:
-  LayerScrollOffsetDelegate() {}
-  virtual ~LayerScrollOffsetDelegate() {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(LayerScrollOffsetDelegate);
-};
-
-}  // namespace cc
-
-#endif  // CC_INPUT_LAYER_SCROLL_OFFSET_DELEGATE_H_