Use words please.

runtime/observatory/tests/service/async_generator_breakpoint_test.dart

Index: runtime/observatory/tests/service/async_generator_breakpoint_test.dart
diff --git a/runtime/observatory/tests/service/async_generator_breakpoint_test.dart b/runtime/observatory/tests/service/async_generator_breakpoint_test.dart
index dbdd0459608426bebadb3501f4241fb847d6a2d5..123edcd83c14031391320e927cd89e85e7332794 100644
--- a/runtime/observatory/tests/service/async_generator_breakpoint_test.dart
+++ b/runtime/observatory/tests/service/async_generator_breakpoint_test.dart
@@ -42,8 +42,8 @@ testeeDo() {
 }
 
 testAsync(Isolate isolate) async {
-  await isolate.rootLib.load();
-  var script = isolate.rootLib.scripts[0];
+  await isolate.rootLibrary.load();
+  var script = isolate.rootLibrary.scripts[0];
 
   var bp1 = await isolate.addBreakpoint(script, 10);
   expect(bp1, isNotNull);
@@ -64,7 +64,7 @@ testAsync(Isolate isolate) async {
 
   var hits = [];
 
-  isolate.eval(isolate.rootLib, 'testerReady = true;')
+  isolate.rootLibrary.evaluate('testerReady = true;')
       .then((Instance result) {
         expect(result.valueAsString, equals('true'));
       });