Move logic of recording main thread scrolling reasons from cc to blink::ScrollManager

third_party/WebKit/Source/core/frame/FrameView.h

Index: third_party/WebKit/Source/core/frame/FrameView.h
diff --git a/third_party/WebKit/Source/core/frame/FrameView.h b/third_party/WebKit/Source/core/frame/FrameView.h
index 82abd868b2ccaebaa3861518dd4589efc38f60ce..a2e89bd76bb0672a89e063cb1c68bbd856d3d6c5 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -799,9 +799,6 @@ class CORE_EXPORT FrameView final
   // Main thread scrolling reasons for this object only. For all reasons,
   // see: mainThreadScrollingReasons().
   MainThreadScrollingReasons mainThreadScrollingReasonsPerFrame() const;
-  void adjustStyleRelatedMainThreadScrollingReasons(const uint32_t reason,
-                                                    bool increase);
-  MainThreadScrollingReasons getStyleRelatedMainThreadScrollingReasons() const;
 
   bool hasVisibleSlowRepaintViewportConstrainedObjects() const;
 
@@ -1215,11 +1212,6 @@ class CORE_EXPORT FrameView final
 
   bool m_isStoringCompositedLayerDebugInfo;
   MainThreadScrollingReasons m_mainThreadScrollingReasons;
-  // For recording main thread scrolling reasons
-  // due to layout object properties. e.g. opacity, transform.
-  // The size of the vector depends on the number of
-  // main thread scrolling reasons.
-  Vector<int> m_mainThreadScrollingReasonsCounter;
 
   // TODO(kenrb): Remove these when https://crbug.com/680606 is resolved.
   std::unique_ptr<CompositorAnimationTimeline> m_animationTimeline;