Refactor service tests in preparation of running on sky_shell

runtime/observatory/tests/service/break_on_function_test.dart

Index: runtime/observatory/tests/service/break_on_function_test.dart
diff --git a/runtime/observatory/tests/service/break_on_function_test.dart b/runtime/observatory/tests/service/break_on_function_test.dart
index 1a0e0eec0eb8cbfb162e638c122e4932d94fed13..e428b25e24b355c175e2b552a81b856cbf13e561 100644
--- a/runtime/observatory/tests/service/break_on_function_test.dart
+++ b/runtime/observatory/tests/service/break_on_function_test.dart
@@ -5,10 +5,13 @@
 
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
+import 'service_test_common.dart';
 import 'test_helper.dart';
 import 'dart:developer';
 
-testFunction(flag) {  // Line 11
+const int LINE_A = 14;
+
+testFunction(flag) {  // Line A.
   if (flag) {
     print("Yes");
   } else {
@@ -40,11 +43,11 @@ hasStoppedAtBreakpoint,
 resumeIsolate,
 
 hasStoppedAtBreakpoint,
-stoppedAtLine(11),
+stoppedAtLine(LINE_A),
 resumeIsolate,
 
 hasStoppedAtBreakpoint,
-stoppedAtLine(11),
+stoppedAtLine(LINE_A),
 resumeIsolate,
 
 ];