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

runtime/observatory/lib/src/elements/heap_profile.dart

Index: runtime/observatory/lib/src/elements/heap_profile.dart
diff --git a/runtime/observatory/lib/src/elements/heap_profile.dart b/runtime/observatory/lib/src/elements/heap_profile.dart
index efdbcdd59f9e4bce821fa8d316902c0092ae6202..01c3608b660dcabb59329e72e8967e5886964723 100644
--- a/runtime/observatory/lib/src/elements/heap_profile.dart
+++ b/runtime/observatory/lib/src/elements/heap_profile.dart
@@ -93,7 +93,7 @@ class HeapProfileElement extends ObservatoryElement {
     _oldPieChart = new Chart('PieChart',
         shadowRoot.querySelector('#oldPieChart'));
     _classTableBody = shadowRoot.querySelector('#classTableBody');
-    _subscription = app.vm.gcEvents.where(
+    _subscription = app.vm.events.stream.where(
         (event) => event.isolate == isolate).listen(_onEvent);
   }