Removed IllegalAccessException and UnsupportedOperationException.

pkg/logging/lib/logging.dart

Index: pkg/logging/lib/logging.dart
diff --git a/pkg/logging/lib/logging.dart b/pkg/logging/lib/logging.dart
index 8dc5ac12ca94dc33789e483c667c4c4895ad892f..ea532244ffdb6ddea1ae5f200e02f7f705fd7402 100644
--- a/pkg/logging/lib/logging.dart
+++ b/pkg/logging/lib/logging.dart
@@ -96,7 +96,7 @@ class Logger {
       _level = value;
     } else {
       if (parent != null) {
-        throw new UnsupportedOperationException(
+        throw new StateError(
             'Please set "hierarchicalLoggingEnabled" to true if you want to '
             'change the level on a non-root logger.');
       }