Clear analyzer warning on Observatory

runtime/observatory/lib/src/elements/code_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 code_view_element;
 
 import 'dart:async';
 import 'dart:html';
-import 'package:observatory/cpu_profile.dart';
+import 'package:observatory/sample_profile.dart';
 import 'package:observatory/service.dart' as S;
 import 'package:observatory/models.dart' as M;
 import 'package:observatory/app.dart'
     show SortedTable, SortedTableColumn, SortedTableRow;
 import 'package:observatory/src/elements/curly_block.dart';
 import 'package:observatory/src/elements/function_ref.dart';
 import 'package:observatory/src/elements/helpers/any_ref.dart';
 import 'package:observatory/src/elements/helpers/nav_bar.dart';
 import 'package:observatory/src/elements/helpers/nav_menu.dart';
 import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
@@ skipping 320 matching lines @@
     S.Code code = _code as S.Code;
     await code.reload();
     _r.dirty();
   }
 
   Future _refreshTicks() async {
     S.Code code = _code as S.Code;
     final isolate = code.isolate;
     S.ServiceMap response =
         await isolate.invokeRpc('_getCpuProfile', {'tags': 'None'});
-    final cpuProfile = new CpuProfile();
+    final cpuProfile = new SampleProfile();
     await cpuProfile.load(isolate, response);
     _r.dirty();
   }
 
   String _formattedAddress(S.CodeInstruction instruction) {
     if (instruction.address == 0) {
       return '';
     }
     return '0x${instruction.address.toRadixString(16)}';
   }
@@ skipping 277 matching lines @@
       case M.CodeKind.stub:
         return 'stub';
       case M.CodeKind.tag:
         return 'tag';
       case M.CodeKind.collected:
         return 'collected';
     }
     throw new Exception('Unknown CodeKind ($kind)');
   }
 }