[rotang] Removing ARC from chromecals

Stop generating the ARC rotation in go/chromecals.

Bug: 911252
Change-Id: I015405865fb7aaf6e7f349c261231a2fdbf08724
Reviewed-on: https://chromium-review.googlesource.com/c/1383691
Reviewed-by: Tiffany Zhang <zhangtiff@chromium.org>
Commit-Queue: Ola Karlsson <olakar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#19822}

cmd/handlers/handle_legacy.go

diff --git a/cmd/handlers/handle_legacy.go b/cmd/handlers/handle_legacy.go
index bfd624e..b2ed5f5 100644
--- a/cmd/handlers/handle_legacy.go
+++ b/cmd/handlers/handle_legacy.go
@@ -288,7 +288,6 @@
 
 var rotaToName = map[string][2]string{
 	"angle":                   {"The ANGLE Wrangle", ""},
-	"arc":                     {"ARC Sheriff+Release duty", ""},
 	"ios_internal_roll":       {"Bling Piper Roll", ""},
 	"bling":                   {"Chrome iOS Build Sheriff", ""},
 	"blink_bug_triage":        {"Blink Bug Triage", ""},