Use getSourceReport for coverage/callsites in Observatory.

runtime/observatory/lib/src/elements/library_view.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 library_view_element;
 
 import 'dart:async';
 import 'observatory_element.dart';
 import 'package:observatory/service.dart';
 import 'package:polymer/polymer.dart';
@@ skipping 12 matching lines @@
   void attached() {
     library.variables.forEach((variable) => variable.reload());
   }
 
   Future refresh() {
     var loads = [];
     loads.add(library.reload());
     library.variables.forEach((variable) => loads.add(variable.reload()));
     return Future.wait(loads);
   }
-
-  Future refreshCoverage() {
-    return library.refreshCoverage();
-  }
 }