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 827969c89f29e05cca150a4fc6828c85e5e1d663..1dd516b9b577cb851b1ad5821a52f013a6483eb3 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -803,9 +803,6 @@ 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;
 
@@ -1221,11 +1218,6 @@ class CORE_EXPORT FrameView final
 
   bool is_storing_composited_layer_debug_info_;
   MainThreadScrollingReasons main_thread_scrolling_reasons_;
-  // 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> main_thread_scrolling_reasons_counter_;
 
   // TODO(kenrb): Remove these when https://crbug.com/680606 is resolved.
   std::unique_ptr<CompositorAnimationTimeline> animation_timeline_;