Make several service protocol RPCs private.

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

Index: runtime/observatory/lib/src/elements/code_view.dart
diff --git a/runtime/observatory/lib/src/elements/code_view.dart b/runtime/observatory/lib/src/elements/code_view.dart
index 868886f2091f7a1a6edf1bc65428e7e0e8dfb93c..4995996fa3754ab019c28dbc5c99cc36e8226c69 100644
--- a/runtime/observatory/lib/src/elements/code_view.dart
+++ b/runtime/observatory/lib/src/elements/code_view.dart
@@ -67,7 +67,7 @@ class CodeViewElement extends ObservatoryElement {
 
   Future refreshTicks() {
     var isolate = code.isolate;
-    return isolate.invokeRpc('getCpuProfile', { 'tags': 'None' })
+    return isolate.invokeRpc('_getCpuProfile', { 'tags': 'None' })
         .then((ServiceMap response) {
             var cpuProfile = new CpuProfile();
             cpuProfile.load(isolate, response);