Fix a typo in the definition of `varApexNames` in `java/dexpreopt_bootjars.go`.

Change-Id: If1267cf18dcd307316cce8d2cac7c6f5c173f3d4
Test: `m nothing` in internal tree
Bug: 180325915
diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
index 17499ee..5565a05 100644
--- a/java/dexpreopt_bootjars.go
+++ b/java/dexpreopt_bootjars.go
@@ -214,7 +214,7 @@
 var artApexNames = []string{
 	"com.android.art",
 	"com.android.art.debug",
-	"com.android.art,testing",
+	"com.android.art.testing",
 	"com.google.android.art",
 	"com.google.android.art.debug",
 	"com.google.android.art.testing",