Removed all analyzer issues from tests

runtime/observatory/tests/service/get_isolate_after_out_of_memory_error_test.dart

Index: runtime/observatory/tests/service/get_isolate_after_out_of_memory_error_test.dart
diff --git a/runtime/observatory/tests/service/get_isolate_after_async_error_test.dart b/runtime/observatory/tests/service/get_isolate_after_out_of_memory_error_test.dart
similarity index 67%
copy from runtime/observatory/tests/service/get_isolate_after_async_error_test.dart
copy to runtime/observatory/tests/service/get_isolate_after_out_of_memory_error_test.dart
index a0c531d16e0c5114dc22cb86424b2fe75116ed06..24bb08319dd72a024127d04f15970d5bd482e443 100644
--- a/runtime/observatory/tests/service/get_isolate_after_async_error_test.dart
+++ b/runtime/observatory/tests/service/get_isolate_after_out_of_memory_error_test.dart
@@ -7,9 +7,10 @@ import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 import 'test_helper.dart';
 import 'service_test_common.dart';
+import 'dart:math';
 
-doThrow() async {
-  throw "oh no"; // Line 13.
+void goOutOfMemory() {
+  new List(pow(2, 53));
 }
 
 var tests = [
@@ -18,11 +19,11 @@ var tests = [
   (Isolate isolate) async {
     await isolate.reload();
     expect(isolate.error, isNotNull);
-    expect(isolate.error.message.contains('oh no'), isTrue);
+    expect(isolate.error.message.contains('Out of Memory'), isTrue);
   }
 ];
 
 main(args) async => runIsolateTests(args,
-                                    tests,
-                                    pause_on_exit: true,
-                                    testeeConcurrent: doThrow);
+                              tests,
+                              pause_on_exit: true,
+                              testeeConcurrent: goOutOfMemory);