change overlay scrollbar hover show to hover fade in

content/child/webthemeengine_impl_default.cc

Index: content/child/webthemeengine_impl_default.cc
diff --git a/content/child/webthemeengine_impl_default.cc b/content/child/webthemeengine_impl_default.cc
index 3296c5ec6349f810405cb4cd1b349f73d61a95f7..232ff4ae9adb1d28c7ae6f374d747911db6f1297 100644
--- a/content/child/webthemeengine_impl_default.cc
+++ b/content/child/webthemeengine_impl_default.cc
@@ -245,10 +245,9 @@ void WebThemeEngineImpl::Paint(
 }
 
 void WebThemeEngineImpl::GetOverlayScrollbarStyle(ScrollbarStyle* style) {
-  style->fade_out_delay_seconds =
-      ui::kOverlayScrollbarFadeOutDelay.InSecondsF();
+  style->fade_out_delay_seconds = ui::kOverlayScrollbarFadeDelay.InSecondsF();
   style->fade_out_duration_seconds =
-      ui::kOverlayScrollbarFadeOutDuration.InSecondsF();
+      ui::kOverlayScrollbarFadeDuration.InSecondsF();
   // The other fields in this struct are used only on Android to draw solid
   // color scrollbars. On other platforms the scrollbars are painted in
   // NativeTheme so these fields are unused.