Fix some observatory analysis issues.

runtime/observatory/lib/src/elements/isolate_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 isolate_view_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'package:observatory/models.dart' as M;
 import 'package:observatory/src/elements/curly_block.dart';
@@ skipping 346 matching lines @@
                         queue: _r.queue)
                   ]
                 : const [],
           new HRElement(),
           new ViewFooterElement(queue: _r.queue)
         ]
     ];
   }
 
   DivElement _populateThreadInfo(M.Thread t) {
-    int index = 0;
     return new DivElement()
       ..classes = ['indent']
       ..children = [
         new SpanElement()..text = '${t.id} ',
         new CurlyBlockElement(queue: _r.queue)
           ..content = [
             new DivElement()
               ..classes = ['indent']
               ..text = 'kind ${t.kindString}',
             new DivElement()
@@ skipping 18 matching lines @@
       _function = await _functions.get(_isolate, frame.function.id);
     }
     if (_isolate.rootLibrary != null) {
       final rootLibrary =
           await _libraries.get(_isolate, _isolate.rootLibrary.id);
       _rootScript = rootLibrary.rootScript;
     }
     _r.dirty();
   }
 }