Revert of [ash-md] Fades overview header in and out

ash/common/wm_window_property.h

Index: ash/common/wm_window_property.h
diff --git a/ash/common/wm_window_property.h b/ash/common/wm_window_property.h
index 9bc0ba8b618c3a7cf1221defc5171eae257c96f4..b96903567933ab61f8eca8e8c17b1a4429c590a4 100644
--- a/ash/common/wm_window_property.h
+++ b/ash/common/wm_window_property.h
@@ -23,9 +23,6 @@
   // Type int. See aura::client::kTopViewInset for details.
   TOP_VIEW_INSET,
 
-  // Type SkColor. See aura::client::kTopViewColor for details.
-  TOP_VIEW_COLOR,
-
   // Type bool. See aura::client:kExcludeFromMruKey for details.
   EXCLUDE_FROM_MRU,
 };