Plumb smooth scrolling in Chromium compositor

cc/input/layer_scroll_offset_delegate.h

Index: cc/input/layer_scroll_offset_delegate.h
diff --git a/cc/input/layer_scroll_offset_delegate.h b/cc/input/layer_scroll_offset_delegate.h
index 0afc4db89e333975c91ff57495f6811a70c18c57..a0c0e0d56032efcc39ed6e8497b1adf81ca4a811 100644
--- a/cc/input/layer_scroll_offset_delegate.h
+++ b/cc/input/layer_scroll_offset_delegate.h
@@ -44,12 +44,6 @@ class LayerScrollOffsetDelegate {
       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.
-  // TODO(hush): Remove after WebView's smooth scrolling path is unified with
-  // Chrome's.
-  virtual bool IsExternalScrollActive() const = 0;
-
   // This is called by the compositor when a fling hitting the root layer
   // requires a scheduled animation update.
   typedef base::Callback<void(base::TimeTicks)> AnimationCallback;