Revert of Implement overlay scrollbar fade out for non-composited scrollers.

third_party/WebKit/Source/platform/scroll/ScrollbarTheme.cpp

Index: third_party/WebKit/Source/platform/scroll/ScrollbarTheme.cpp
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollbarTheme.cpp b/third_party/WebKit/Source/platform/scroll/ScrollbarTheme.cpp
index 6579fe491766dc6ef2c702aedbb0000f56081906..9d36150257e4681000f95dbb1da3bee179bc2e3d 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollbarTheme.cpp
+++ b/third_party/WebKit/Source/platform/scroll/ScrollbarTheme.cpp
@@ -231,16 +231,6 @@
   return Platform::current()->scrollbarBehavior()->shouldSnapBackToDragOrigin(
       mousePosition, trackRect(scrollbar),
       scrollbar.orientation() == HorizontalScrollbar);
-}
-
-double ScrollbarTheme::overlayScrollbarFadeOutDelaySeconds() const {
-  // On Mac, fading is controlled by the painting code in ScrollAnimatorMac.
-  return 0.0;
-}
-
-double ScrollbarTheme::overlayScrollbarFadeOutDurationSeconds() const {
-  // On Mac, fading is controlled by the painting code in ScrollAnimatorMac.
-  return 0.0;
 }
 
 int ScrollbarTheme::thumbPosition(const ScrollbarThemeClient& scrollbar,