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

runtime/vm/coverage.cc

 // 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.
 
 #include "vm/coverage.h"
 
 #include "include/dart_api.h"
 
 #include "vm/compiler.h"
 #include "vm/isolate.h"
@@ skipping 253 matching lines @@
   CoverageFilterAll default_filter;
   if (filter == NULL) {
     filter = &default_filter;
   }
   const GrowableObjectArray& libs = GrowableObjectArray::Handle(
       isolate, isolate->object_store()->libraries());
   Library& lib = Library::Handle();
   Class& cls = Class::Handle();
   JSONObject coverage(stream);
   coverage.AddProperty("type", "CodeCoverage");
-  coverage.AddProperty("id", "coverage");
   {
     JSONArray jsarr(&coverage, "coverage");
     for (int i = 0; i < libs.Length(); i++) {
       lib ^= libs.At(i);
       ClassDictionaryIterator it(lib, ClassDictionaryIterator::kIteratePrivate);
       while (it.HasNext()) {
         cls = it.GetNextClass();
         ASSERT(!cls.IsNull());
         PrintClass(lib, cls, jsarr, filter);
       }
     }
   }
 }
 
 
 }  // namespace dart