Clean LayerImpl's scroll offset callers in unit tests.

cc/layers/layer_impl.h

Index: cc/layers/layer_impl.h
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index 91d3e0ded45a94a48f336998b2eb7c9d4a1d80f1..3dc37dfbbca251e8d9ebd13d407bc59e41c3531f 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -448,16 +448,8 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
   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;