Revert of Revert of Early terminate flings when scrolling impossible

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 072e8e7efbf2d6ae30186f8514e2d47b790961b8..928f7a7fd478a6527cf6b4ef56214e0ded9eaa15 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -2317,11 +2317,8 @@
   accumulated_root_overscroll_ += unused_root_delta;
   bool did_overscroll = !unused_root_delta.IsZero();
   if (did_overscroll && input_handler_client_) {
-    DidOverscrollParams params;
-    params.accumulated_overscroll = accumulated_root_overscroll_;
-    params.latest_overscroll_delta = unused_root_delta;
-    params.current_fling_velocity = current_fling_velocity_;
-    input_handler_client_->DidOverscroll(params);
+    input_handler_client_->DidOverscroll(accumulated_root_overscroll_,
+                                         unused_root_delta);
   }
 
   return did_scroll_content || did_scroll_top_controls;
@@ -2384,7 +2381,6 @@
   active_tree_->ClearCurrentlyScrollingLayer();
   did_lock_scrolling_layer_ = false;
   accumulated_root_overscroll_ = gfx::Vector2dF();
-  current_fling_velocity_ = gfx::Vector2dF();
 }
 
 void LayerTreeHostImpl::ScrollEnd() {
@@ -2413,11 +2409,6 @@
   }
 
   return ScrollStarted;
-}
-
-void LayerTreeHostImpl::NotifyCurrentFlingVelocity(
-    const gfx::Vector2dF& velocity) {
-  current_fling_velocity_ = velocity;
 }
 
 float LayerTreeHostImpl::DeviceSpaceDistanceToLayer(