Revert of Implement Element.scrollIntoView for scroll-behavior: smooth.

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

Index: third_party/WebKit/Source/core/frame/RootFrameViewport.cpp
diff --git a/third_party/WebKit/Source/core/frame/RootFrameViewport.cpp b/third_party/WebKit/Source/core/frame/RootFrameViewport.cpp
index d89b8b0ce21eeeb4beacd3bc15a6e253c20773bd..cc76a0e89e91eb23462eb67889ddc9eb4ac4afdf 100644
--- a/third_party/WebKit/Source/core/frame/RootFrameViewport.cpp
+++ b/third_party/WebKit/Source/core/frame/RootFrameViewport.cpp
@@ -209,7 +209,6 @@
 LayoutRect RootFrameViewport::ScrollIntoView(const LayoutRect& rect_in_content,
                                              const ScrollAlignment& align_x,
                                              const ScrollAlignment& align_y,
-                                             bool is_smooth,
                                              ScrollType scroll_type) {
   // We want to move the rect into the viewport that excludes the scrollbars so
   // we intersect the visual viewport with the scrollbar-excluded frameView
@@ -230,13 +229,8 @@
   LayoutRect target_viewport = ScrollAlignment::GetRectToExpose(
       view_rect_in_content, rect_in_content, align_x, align_y);
   if (target_viewport != view_rect_in_content) {
-    ScrollOffset target_offset(target_viewport.X(), target_viewport.Y());
-    if (is_smooth) {
-      DCHECK(scroll_type == kProgrammaticScroll);
-      GetSmoothScrollSequencer()->QueueAnimation(this, target_offset);
-    } else {
-      SetScrollOffset(target_offset, scroll_type);
-    }
+    SetScrollOffset(ScrollOffset(target_viewport.X(), target_viewport.Y()),
+                    scroll_type);
   }
 
   // RootFrameViewport only changes the viewport relative to the document so we
@@ -437,10 +431,6 @@
   return LayoutViewport().GetChromeClient();
 }
 
-SmoothScrollSequencer* RootFrameViewport::GetSmoothScrollSequencer() const {
-  return LayoutViewport().GetSmoothScrollSequencer();
-}
-
 void RootFrameViewport::ServiceScrollAnimations(double monotonic_time) {
   ScrollableArea::ServiceScrollAnimations(monotonic_time);
   LayoutViewport().ServiceScrollAnimations(monotonic_time);