Replace and remove JavaException(s).

pkg/analyzer/lib/src/generated/testing/element_factory.dart

Index: pkg/analyzer/lib/src/generated/testing/element_factory.dart
diff --git a/pkg/analyzer/lib/src/generated/testing/element_factory.dart b/pkg/analyzer/lib/src/generated/testing/element_factory.dart
index 106977c835d033c2079830d223ca0c2775dfa369..f0067a699cbefdf3991481bc3ad2a6f2cb4ff1f0 100644
--- a/pkg/analyzer/lib/src/generated/testing/element_factory.dart
+++ b/pkg/analyzer/lib/src/generated/testing/element_factory.dart
@@ -287,7 +287,7 @@ class ElementFactory {
     int nameCount = names == null ? 0 : names.length;
     int typeCount = namedParameters == null ? 0 : namedParameters.length;
     if (names != null && nameCount != typeCount) {
-      throw new IllegalStateException(
+      throw new StateError(
           "The passed String[] and ClassElement[] arrays had different lengths.");
     }
     int totalCount = normalCount + nameCount;