Some cleanup changes.

--
MOS_MIGRATED_REVID=87821306
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/FunctionDefStatement.java b/src/main/java/com/google/devtools/build/lib/syntax/FunctionDefStatement.java
index f06829a..28639bc 100644
--- a/src/main/java/com/google/devtools/build/lib/syntax/FunctionDefStatement.java
+++ b/src/main/java/com/google/devtools/build/lib/syntax/FunctionDefStatement.java
@@ -52,7 +52,7 @@
     ArrayList<SkylarkType> types = null;
 
     if (defaultExpressions != null) {
-      defaultValues = new ArrayList<Object>(defaultExpressions.size());
+      defaultValues = new ArrayList<>(defaultExpressions.size());
       for (Expression expr : defaultExpressions) {
         defaultValues.add(expr.eval(env));
       }