bazel syntax: rename ValidationEnvironment -> Resolver

parseAndValidate is not yet renamed, to avoid changing
the API used directly by copybara. It will go away
eventually.

PiperOrigin-RevId: 308264655
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/StarlarkFile.java b/src/main/java/com/google/devtools/build/lib/syntax/StarlarkFile.java
index 8850cfd..f37a126 100644
--- a/src/main/java/com/google/devtools/build/lib/syntax/StarlarkFile.java
+++ b/src/main/java/com/google/devtools/build/lib/syntax/StarlarkFile.java
@@ -31,7 +31,7 @@
   private final ImmutableList<Statement> statements;
   private final FileOptions options;
   private final ImmutableList<Comment> comments;
-  final List<SyntaxError> errors; // appended to by ValidationEnvironment
+  final List<SyntaxError> errors; // appended to by Resolver
   @Nullable private final String contentHashCode;
 
   @Override