A few small changes towards untangling our tests:
- fix some minor warnings

--
MOS_MIGRATED_REVID=86065345
diff --git a/src/main/java/com/google/devtools/build/lib/packages/PackageFactory.java b/src/main/java/com/google/devtools/build/lib/packages/PackageFactory.java
index abf63f9..c8b6710 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/PackageFactory.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/PackageFactory.java
@@ -347,8 +347,14 @@
 
   @VisibleForTesting
   public PackageFactory(RuleClassProvider ruleClassProvider,
-      EnvironmentExtension environmentExtensions) {
-    this(ruleClassProvider, null, ImmutableList.of(environmentExtensions));
+      EnvironmentExtension environmentExtension) {
+    this(ruleClassProvider, null, ImmutableList.of(environmentExtension));
+  }
+
+  @VisibleForTesting
+  public PackageFactory(RuleClassProvider ruleClassProvider,
+      Iterable<EnvironmentExtension> environmentExtensions) {
+    this(ruleClassProvider, null, environmentExtensions);
   }
 
   /**