Revert "Pull chromium at 2c3ffb2355a27c32f45e508ef861416b820c823b"

cc/input/scroll_elasticity_helper.cc

Index: cc/input/scroll_elasticity_helper.cc
diff --git a/cc/input/scroll_elasticity_helper.cc b/cc/input/scroll_elasticity_helper.cc
index 1c496d905318d486c0171c710ff52d74d30d0c82..1e9fe7dff9f59fd482a286d89fc8dc5a613ac2aa 100644
--- a/cc/input/scroll_elasticity_helper.cc
+++ b/cc/input/scroll_elasticity_helper.cc
@@ -15,7 +15,6 @@ class ScrollElasticityHelperImpl : public ScrollElasticityHelper {
   explicit ScrollElasticityHelperImpl(LayerTreeHostImpl* layer_tree_host_impl);
   ~ScrollElasticityHelperImpl() override;
 
-  bool IsUserScrollable() const override;
   gfx::Vector2dF StretchAmount() const override;
   void SetStretchAmount(const gfx::Vector2dF& stretch_amount) override;
   gfx::ScrollOffset ScrollOffset() const override;
@@ -35,14 +34,6 @@ ScrollElasticityHelperImpl::ScrollElasticityHelperImpl(
 ScrollElasticityHelperImpl::~ScrollElasticityHelperImpl() {
 }
 
-bool ScrollElasticityHelperImpl::IsUserScrollable() const {
-  LayerImpl* layer = layer_tree_host_impl_->OuterViewportScrollLayer();
-  if (!layer)
-    return false;
-  return layer->user_scrollable_horizontal() ||
-         layer->user_scrollable_vertical();
-}
-
 gfx::Vector2dF ScrollElasticityHelperImpl::StretchAmount() const {
   return layer_tree_host_impl_->active_tree()->elastic_overscroll()->Current(
       true);