cros: Remove ash_switches.h leftovers

Get rid of unused ash switch declarations, leftovers from
crrev.com/c/1563598.

R=sky@chromium.org

Bug: None
Change-Id: I5f604a7fa4005caa5d65db1ec5f0cc5d6cd9a60e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346727
Auto-Submit: Nick Yamane <nickdiego@igalia.com>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796682}

ash/public/cpp/ash_switches.h

@@ -40,16 +40,6 @@ ASH_PUBLIC_EXPORT extern const char kAshUiMode[];
 ASH_PUBLIC_EXPORT extern const char kAshUiModeClamshell[];
 ASH_PUBLIC_EXPORT extern const char kAshUiModeTablet[];
 ASH_PUBLIC_EXPORT extern const char kAshHideNotificationsForFactory[];
-ASH_PUBLIC_EXPORT extern const char kAshShelfColor[];
-ASH_PUBLIC_EXPORT extern const char kAshShelfColorEnabled[];
-ASH_PUBLIC_EXPORT extern const char kAshShelfColorDisabled[];
-ASH_PUBLIC_EXPORT extern const char kAshShelfColorScheme[];
-ASH_PUBLIC_EXPORT extern const char kAshShelfColorSchemeLightMuted[];
-ASH_PUBLIC_EXPORT extern const char kAshShelfColorSchemeLightVibrant[];
-ASH_PUBLIC_EXPORT extern const char kAshShelfColorSchemeNormalMuted[];
-ASH_PUBLIC_EXPORT extern const char kAshShelfColorSchemeNormalVibrant[];
-ASH_PUBLIC_EXPORT extern const char kAshShelfColorSchemeDarkMuted[];
-ASH_PUBLIC_EXPORT extern const char kAshShelfColorSchemeDarkVibrant[];
 ASH_PUBLIC_EXPORT extern const char kAshSideVolumeButtonPosition[];
 ASH_PUBLIC_EXPORT extern const char kAshTouchHud[];
 ASH_PUBLIC_EXPORT extern const char kAuraLegacyPowerButton[];