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

third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp

Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
index 948b6c2cc680172bba67192dbcc2c7afcbb06b5e..a268a74f369dd4415930f7e739c785ac6ff50151 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
@@ -209,13 +209,6 @@
   return nullptr;
 }
 
-SmoothScrollSequencer* PaintLayerScrollableArea::GetSmoothScrollSequencer()
-    const {
-  if (Page* page = Box().GetFrame()->GetPage())
-    return page->GetSmoothScrollSequencer();
-  return nullptr;
-}
-
 GraphicsLayer* PaintLayerScrollableArea::LayerForScrolling() const {
   return Layer()->HasCompositedLayerMapping()
              ? Layer()->GetCompositedLayerMapping()->ScrollingContentsLayer()
@@ -1738,7 +1731,6 @@
     const LayoutRect& rect,
     const ScrollAlignment& align_x,
     const ScrollAlignment& align_y,
-    bool is_smooth,
     ScrollType scroll_type) {
   LayoutRect local_expose_rect(
       Box()
@@ -1752,14 +1744,8 @@
   ScrollOffset old_scroll_offset = GetScrollOffset();
   ScrollOffset new_scroll_offset(ClampScrollOffset(RoundedIntSize(
       ToScrollOffset(FloatPoint(r.Location()) + old_scroll_offset))));
-  if (is_smooth) {
-    DCHECK(scroll_type == kProgrammaticScroll);
-    GetSmoothScrollSequencer()->QueueAnimation(this, new_scroll_offset);
-  } else {
-    SetScrollOffset(new_scroll_offset, scroll_type, kScrollBehaviorInstant);
-  }
-  ScrollOffset scroll_offset_difference =
-      ClampScrollOffset(new_scroll_offset) - old_scroll_offset;
+  SetScrollOffset(new_scroll_offset, scroll_type, kScrollBehaviorInstant);
+  ScrollOffset scroll_offset_difference = GetScrollOffset() - old_scroll_offset;
   local_expose_rect.Move(-LayoutSize(scroll_offset_difference));
 
   LayoutRect intersect =