Some cleanup changes.

--
MOS_MIGRATED_REVID=87821306
diff --git a/src/main/java/com/google/devtools/build/lib/packages/TargetUtils.java b/src/main/java/com/google/devtools/build/lib/packages/TargetUtils.java
index 3710eeb..fb0cee9 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/TargetUtils.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/TargetUtils.java
@@ -191,7 +191,7 @@
    * <p>In practice this is the part before the "_", if any, otherwise the entire rule class name.
    */
   public static String getRuleLanguage(String ruleClass) {
-    int index = ruleClass.lastIndexOf("_");
+    int index = ruleClass.lastIndexOf('_');
     // Chop off "_binary" or "_test".
     return index != -1 ? ruleClass.substring(0, index) : ruleClass;
   }