Revert "Add the streamListen and streamCancel rpcs to the vm service."

runtime/observatory/tests/service/coverage_test.dart

Index: runtime/observatory/tests/service/coverage_test.dart
diff --git a/runtime/observatory/tests/service/coverage_test.dart b/runtime/observatory/tests/service/coverage_test.dart
index 6f481100d03a40074aaf089070ec76baa8c361c9..54e90807690e729a67346b1226d79ff488297b4c 100644
--- a/runtime/observatory/tests/service/coverage_test.dart
+++ b/runtime/observatory/tests/service/coverage_test.dart
@@ -57,7 +57,7 @@ var tests = [
   return isolate.rootLibrary.load().then((_) {
       // Set up a listener to wait for breakpoint events.
       Completer completer = new Completer();
-      isolate.vm.debugEvents.listen((ServiceEvent event) {
+      isolate.vm.events.stream.listen((ServiceEvent event) {
         if (event.eventType == ServiceEvent.kPauseBreakpoint) {
           print('Breakpoint reached');
           completer.complete();