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

runtime/observatory/lib/src/app/page.dart

Index: runtime/observatory/lib/src/app/page.dart
diff --git a/runtime/observatory/lib/src/app/page.dart b/runtime/observatory/lib/src/app/page.dart
index ba213f7050ea026087cdfedc6ab748ce0728ce52..1151f67c6a4471430bde3bc55c8bb674992df5ba 100644
--- a/runtime/observatory/lib/src/app/page.dart
+++ b/runtime/observatory/lib/src/app/page.dart
@@ -191,6 +191,7 @@ class DebuggerPage extends SimplePage {
       if (element != null) {
         /// Update the page.
         DebuggerPageElement page = element;
+        page.app = app;
         page.isolate = isolate;
       }
     });