Revert of Remove FrameView::Root

third_party/WebKit/Source/web/WebInputEventConversion.cpp

Index: third_party/WebKit/Source/web/WebInputEventConversion.cpp
diff --git a/third_party/WebKit/Source/web/WebInputEventConversion.cpp b/third_party/WebKit/Source/web/WebInputEventConversion.cpp
index ad5a6cd55efa5c966ae0f086467bcf27e90ab090..57d32e1e3a38a8def83923de35514a2b7ad72287 100644
--- a/third_party/WebKit/Source/web/WebInputEventConversion.cpp
+++ b/third_party/WebKit/Source/web/WebInputEventConversion.cpp
@@ -51,7 +51,7 @@
 float FrameScale(const FrameView* frame_view) {
   float scale = 1;
   if (frame_view) {
-    FrameView* root_view = frame_view->GetFrame().LocalFrameRoot()->View();
+    FrameView* root_view = frame_view->Root();
     if (root_view)
       scale = root_view->InputEventsScaleFactor();
   }
@@ -64,7 +64,7 @@
   IntPoint visual_viewport;
   FloatSize overscroll_offset;
   if (frame_view) {
-    FrameView* root_view = frame_view->GetFrame().LocalFrameRoot()->View();
+    FrameView* root_view = frame_view->Root();
     if (root_view) {
       scale = root_view->InputEventsScaleFactor();
       offset = FloatSize(root_view->InputEventsOffsetForEmulation());