Revert "Touchpad scroll latching enabled for Mac behind flag."

cc/trees/layer_tree_host_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_TREES_LAYER_TREE_HOST_IMPL_H_
 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
 
 #include <stddef.h>
 
 #include <bitset>
@@ skipping 574 matching lines @@
 
   // Returns true if a scroll offset animation is created and false if we scroll
   // by the desired amount without an animation.
   bool ScrollAnimationCreate(ScrollNode* scroll_node,
                              const gfx::Vector2dF& scroll_amount,
                              base::TimeDelta delayed_by);
 
   void SetLayerTreeMutator(std::unique_ptr<LayerTreeMutator> mutator);
   LayerTreeMutator* mutator() { return mutator_.get(); }
 
-  void ClearCurrentlyScrollingLayerForTesting() {
-    ClearCurrentlyScrollingLayer();
-  }
-
   LayerImpl* ViewportMainScrollLayer();
 
  protected:
   LayerTreeHostImpl(
       const LayerTreeSettings& settings,
       LayerTreeHostImplClient* client,
       TaskRunnerProvider* task_runner_provider,
       RenderingStatsInstrumentation* rendering_stats_instrumentation,
       TaskGraphRunner* task_graph_runner,
       std::unique_ptr<AnimationHost> animation_host,
@@ skipping 221 matching lines @@
 
   std::unique_ptr<PendingTreeDurationHistogramTimer>
       pending_tree_duration_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_