[ash-md] Erases the pre-MD code path for Overview Mode

ash/common/ash_switches.h

Index: ash/common/ash_switches.h
diff --git a/ash/common/ash_switches.h b/ash/common/ash_switches.h
index be5204ffb0915005c2a39901b24195e3d1f0dfa2..ddaba761af86e1570d02b6fc255822d454202710 100644
--- a/ash/common/ash_switches.h
+++ b/ash/common/ash_switches.h
@@ -38,15 +38,12 @@ ASH_EXPORT extern const char kAshEnableUnifiedDesktop[];
 ASH_EXPORT extern const char kAshEnableTouchView[];
 ASH_EXPORT extern const char kAshEnableMirroredScreen[];
 ASH_EXPORT extern const char kAshDisableStableOverviewOrder[];
-ASH_EXPORT extern const char kAshEnableStableOverviewOrder[];
 ASH_EXPORT extern const char kAshEnableTouchViewTesting[];
 ASH_EXPORT extern const char kAshHideNotificationsForFactory[];
 ASH_EXPORT extern const char kAshMaterialDesign[];
 ASH_EXPORT extern const char kAshMaterialDesignDisabled[];
 ASH_EXPORT extern const char kAshMaterialDesignEnabled[];
 ASH_EXPORT extern const char kAshMaterialDesignExperimental[];
-ASH_EXPORT extern const char kAshMaxWindowsToUseMaskInOverview[];
-ASH_EXPORT extern const char kAshMaxWindowsToUseShapeInOverview[];
 ASH_EXPORT extern const char kAshTouchHud[];
 ASH_EXPORT extern const char kAuraLegacyPowerButton[];