[tint] Remove `msl-ir` format from E2E test runner

The CMake bots have been updated to stop using this format.

Bug: 388013849
Change-Id: Ic5e8061954e3aab94ae183d03e3bdd3260a2e81a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/224994
Commit-Queue: James Price <jrprice@google.com>
Reviewed-by: dan sinclair <dsinclair@chromium.org>
diff --git a/tools/src/cmd/tests/main.go b/tools/src/cmd/tests/main.go
index 0c9d996..9287c18 100644
--- a/tools/src/cmd/tests/main.go
+++ b/tools/src/cmd/tests/main.go
@@ -67,7 +67,6 @@
 	hlslDXC   = outputFormat("hlsl-dxc")
 	hlslDXCIR = outputFormat("hlsl-dxc-ir")
 	msl       = outputFormat("msl")
-	mslIR     = outputFormat("msl-ir")
 	spvasm    = outputFormat("spvasm")
 	wgsl      = outputFormat("wgsl")
 )
@@ -235,10 +234,6 @@
 			if err != nil {
 				return err
 			}
-			// TODO(388013849): Remove when CQ is updated to stop using this format.
-			if parsed[0] == mslIR {
-				continue
-			}
 			formats = append(formats, parsed...)
 		}
 	}
@@ -1058,8 +1053,6 @@
 		return []outputFormat{spvasm}, nil
 	case "msl":
 		return []outputFormat{msl}, nil
-	case "msl-ir":
-		return []outputFormat{mslIR}, nil
 	case "hlsl":
 		return []outputFormat{hlslDXC, hlslFXC}, nil
 	case "hlsl-dxc":