change overlay scrollbar hover show to hover fade in

cc/layers/scrollbar_layer_unittest.cc

Index: cc/layers/scrollbar_layer_unittest.cc
diff --git a/cc/layers/scrollbar_layer_unittest.cc b/cc/layers/scrollbar_layer_unittest.cc
index 65cd0610bde1a8db191421d2deb9484895c7066c..5eda03ffc9345ff9a9719993a9b84f03e4e9f38d 100644
--- a/cc/layers/scrollbar_layer_unittest.cc
+++ b/cc/layers/scrollbar_layer_unittest.cc
@@ -106,11 +106,9 @@ class ScrollbarLayerTest : public testing::Test {
     layer_tree_settings_.use_zero_copy = true;
     layer_tree_settings_.scrollbar_animator =
         LayerTreeSettings::ANDROID_OVERLAY;
-    layer_tree_settings_.scrollbar_show_delay =
+    layer_tree_settings_.scrollbar_fade_delay =
         base::TimeDelta::FromMilliseconds(20);
-    layer_tree_settings_.scrollbar_fade_out_delay =
-        base::TimeDelta::FromMilliseconds(20);
-    layer_tree_settings_.scrollbar_fade_out_duration =
+    layer_tree_settings_.scrollbar_fade_duration =
         base::TimeDelta::FromMilliseconds(20);
 
     scrollbar_layer_id_ = -1;