Clean LayerImpl's scroll offset callers in unit tests.

cc/layers/layer_impl.h

 // Copyright 2011 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_LAYERS_LAYER_IMPL_H_
 #define CC_LAYERS_LAYER_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 430 matching lines @@
 
   void SetBounds(const gfx::Size& bounds);
   gfx::Size bounds() const;
   // Like bounds() but doesn't snap to int. Lossy on giant pages (e.g. millions
   // of pixels) due to use of single precision float.
   gfx::SizeF BoundsForScrolling() const;
   void SetBoundsDelta(const gfx::Vector2dF& bounds_delta);
   gfx::Vector2dF bounds_delta() const { return bounds_delta_; }
 
   void SetCurrentScrollOffset(const gfx::ScrollOffset& scroll_offset);
-  // must only be called by tests when updating scroll offset of a single layer,
-  // the standard process to update scroll offsets is to call
-  // ScrollTree::UpdateScrollOffsetMap() which updates scroll offsets of all
-  // layers.
-  void PushScrollOffsetFromMainThread(const gfx::ScrollOffset& scroll_offset);
-
   gfx::ScrollOffset CurrentScrollOffset() const;
-  gfx::ScrollOffset BaseScrollOffset() const;
   gfx::Vector2dF ScrollDelta() const;
-  void SetScrollDelta(const gfx::Vector2dF& delta);
 
   gfx::ScrollOffset MaxScrollOffset() const;
   gfx::ScrollOffset ClampScrollOffsetToLimits(gfx::ScrollOffset offset) const;
   gfx::Vector2dF ClampScrollToMaxScrollOffset();
   void SetScrollCompensationAdjustment(const gfx::Vector2dF& scroll_offset) {
     scroll_compensation_adjustment_ = scroll_offset;
   }
   gfx::Vector2dF ScrollCompensationAdjustment() const {
     return scroll_compensation_adjustment_;
   }
@@ skipping 384 matching lines @@
   // If true, the layer or one of its descendants has a touch handler.
   bool layer_or_descendant_has_touch_handler_;
   bool sorted_for_recursion_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_H_