[ash-md] Changed opaque shelf color darkening from 90% to 70%.

ash/common/shelf/shelf_constants.cc

Index: ash/common/shelf/shelf_constants.cc
diff --git a/ash/common/shelf/shelf_constants.cc b/ash/common/shelf/shelf_constants.cc
index c260855e5ef027af793f4791ded40593873d0a94..25a8fe3f03717bf021bcd7a3223ddf98dfd3d905 100644
--- a/ash/common/shelf/shelf_constants.cc
+++ b/ash/common/shelf/shelf_constants.cc
@@ -23,7 +23,7 @@ const float kShelfInkDropVisibleOpacity = 0.2f;
 const SkColor kShelfIconColor = SK_ColorWHITE;
 const int kShelfTranslucentAlpha = 153;
 const int kShelfTranslucentColorDarkenAlpha = 102;
-const int kShelfOpaqueColorDarkenAlpha = 230;
+const int kShelfOpaqueColorDarkenAlpha = 178;
 const int kOverflowButtonSize = 32;
 const int kOverflowButtonCornerRadius = 2;
 const int kAppListButtonRadius = kOverflowButtonSize / 2;