Enable Ash material design shelf and system menu by default

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 d2cfc6fccf31cbe06142d406868bddade3470499..b9a573dc21d6a9e7aaffcd69803c4a90c61f675b 100644
--- a/ash/common/shelf/shelf_constants.cc
+++ b/ash/common/shelf/shelf_constants.cc
@@ -26,10 +26,10 @@ const int kOverflowButtonCornerRadius = 2;
 const int kAppListButtonRadius = kOverflowButtonSize / 2;
 
 int GetShelfConstant(ShelfConstant shelf_constant) {
-  const int kShelfBackgroundAlpha[] = {204, 204, 153};
-  const int kShelfSize[] = {47, 47, 48};
-  const int kShelfButtonSpacing[] = {10, 10, 16};
-  const int kShelfButtonSize[] = {44, 44, 48};
+  const int kShelfBackgroundAlpha[] = {204, 153, 153};
+  const int kShelfSize[] = {47, 48, 48};
+  const int kShelfButtonSpacing[] = {10, 16, 16};
+  const int kShelfButtonSize[] = {44, 48, 48};
   const int kShelfInsetsForAutoHide[] = {3, 0, 0};
 
   const int mode = MaterialDesignController::GetMode();