Fix overlay scroll bar color on elements with dark background

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

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 05c65b4af6f909da3e4182b525a67d124ed1a954..9bce6c9366ea35141621d66abfb939acf5ee148b 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -361,24 +361,6 @@ void FrameView::invalidateAllCustomScrollbarsOnActiveChanged()
         recalculateCustomScrollbarStyle();
 }
 
-void FrameView::recalculateScrollbarOverlayStyle()
-{
-    ScrollbarOverlayStyle oldOverlayStyle = scrollbarOverlayStyle();
-    ScrollbarOverlayStyle overlayStyle = ScrollbarOverlayStyleDefault;
-
-    Color backgroundColor = documentBackgroundColor();
-    // Reduce the background color from RGB to a lightness value
-    // and determine which scrollbar style to use based on a lightness
-    // heuristic.
-    double hue, saturation, lightness;
-    backgroundColor.getHSL(hue, saturation, lightness);
-    if (lightness <= .5)
-        overlayStyle = ScrollbarOverlayStyleLight;
-
-    if (oldOverlayStyle != overlayStyle)
-        setScrollbarOverlayStyle(overlayStyle);
-}
-
 void FrameView::clear()
 {
     reset();
@@ -1921,7 +1903,7 @@ void FrameView::setBaseBackgroundColor(const Color& backgroundColor)
         if (compositedLayerMapping->mainGraphicsLayer())
             compositedLayerMapping->mainGraphicsLayer()->setNeedsDisplay();
     }
-    recalculateScrollbarOverlayStyle();
+    recalculateScrollbarOverlayStyle(documentBackgroundColor());
 }
 
 void FrameView::updateBackgroundRecursively(const Color& backgroundColor, bool transparent)