Begin migrating the vm service from a rest-style interface to a json-rpc style interface.

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

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library script_inset_element;
 
 import 'dart:html';
 import 'observatory_element.dart';
 import 'package:observatory/service.dart';
 import 'package:polymer/polymer.dart';
@@ skipping 137 matching lines @@
 class BreakpointToggleElement extends ObservatoryElement {
   @published ScriptLine line;
   @observable bool busy = false;
 
   void toggleBreakpoint(var a, var b, var c) {
     if (busy) {
       return;
     }
     busy = true;
     if (line.bpt == null) {
-      // No breakpoint.  Set it.
-      line.script.isolate.setBreakpoint(line.script, line.line).then((_) {
+      // No breakpoint.  Add it.
+      line.script.isolate.addBreakpoint(line.script, line.line).then((_) {
           busy = false;
       });
     } else {
       // Existing breakpoint.  Remove it.
-      line.script.isolate.clearBreakpoint(line.bpt).then((_) {
+      line.script.isolate.removeBreakpoint(line.bpt).then((_) {
           busy = false;
       });
     }
   }
 
   BreakpointToggleElement.created() : super.created();
 }