Address observatory analysis issues.

runtime/observatory/tests/service/evaluate_with_scope_test.dart

Index: runtime/observatory/tests/service/evaluate_with_scope_test.dart
diff --git a/runtime/observatory/tests/service/evaluate_with_scope_test.dart b/runtime/observatory/tests/service/evaluate_with_scope_test.dart
index 453a68908e5c1a571a9b6e06dc65d97831abcbc4..84a7662d3d6bf2b66e29dfe602e774943749947e 100644
--- a/runtime/observatory/tests/service/evaluate_with_scope_test.dart
+++ b/runtime/observatory/tests/service/evaluate_with_scope_test.dart
@@ -3,11 +3,9 @@
 // BSD-style license that can be found in the LICENSE file.
 // VMOptions=--error_on_bad_type --error_on_bad_override
 
-import 'dart:async';
-import 'dart:developer';
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
-import 'service_test_common.dart';
+
 import 'test_helper.dart';
 
 var thing1;