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 eed99366cee501408991c81894f4a0694309cff8..dc8006fea1f16ab6aeddbd00ba06c9c9bef29ebc 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -795,9 +795,6 @@ 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;
 
@@ -1213,11 +1210,6 @@ 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;