Remove FrameView::Root

BUG=637460

Review-Url: https://codereview.chromium.org/2849383002
Cr-Commit-Position: refs/heads/master@{#468588}

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

@@ -3848,13 +3848,6 @@ void FrameView::RemoveAnimatingScrollableArea(ScrollableArea* scrollable_area) {
   animating_scrollable_areas_->erase(scrollable_area);
 }
 
-FrameView* FrameView::Root() const {
-  const FrameView* top = this;
-  while (top->Parent())
-    top = ToFrameView(top->Parent());
-  return const_cast<FrameView*>(top);
-}
-
 void FrameView::SetParent(FrameViewBase* parent_frame_view_base) {
   FrameView* parent = ToFrameView(parent_frame_view_base);
   if (parent == parent_)

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

@@ -498,7 +498,6 @@ class CORE_EXPORT FrameView final
   void SetSelfVisible(bool v) { self_visible_ = v; }
   void SetParent(FrameViewBase*) override;
   FrameViewBase* Parent() const override { return parent_; }
-  FrameView* Root() const;
   void RemoveChild(FrameViewBase*);
   void AddChild(FrameViewBase*);
   const ChildrenSet* Children() const { return &children_; }

third_party/WebKit/Source/web/WebInputEventConversion.cpp

@@ -51,7 +51,7 @@ namespace {
 float FrameScale(const FrameView* frame_view) {
   float scale = 1;
   if (frame_view) {
-    FrameView* root_view = frame_view->Root();
+    FrameView* root_view = frame_view->GetFrame().LocalFrameRoot()->View();
     if (root_view)
       scale = root_view->InputEventsScaleFactor();
   }
@@ -64,7 +64,7 @@ FloatPoint FrameTranslation(const FrameView* frame_view) {
   IntPoint visual_viewport;
   FloatSize overscroll_offset;
   if (frame_view) {
-    FrameView* root_view = frame_view->Root();
+    FrameView* root_view = frame_view->GetFrame().LocalFrameRoot()->View();
     if (root_view) {
       scale = root_view->InputEventsScaleFactor();
       offset = FloatSize(root_view->InputEventsOffsetForEmulation());