Clear analyzer warning on Observatory

runtime/observatory/lib/sample_profile.dart

Index: runtime/observatory/lib/sample_profile.dart
diff --git a/runtime/observatory/lib/cpu_profile.dart b/runtime/observatory/lib/sample_profile.dart
similarity index 84%
rename from runtime/observatory/lib/cpu_profile.dart
rename to runtime/observatory/lib/sample_profile.dart
index ccc53c5293fbbc6ae5023deb0cc7465ec97f7db7..f81f3bd6580b11bf94bc147977719542ee6146cd 100644
--- a/runtime/observatory/lib/cpu_profile.dart
+++ b/runtime/observatory/lib/sample_profile.dart
@@ -2,7 +2,7 @@
 // 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 cpu_profiler;
+library sample_profiler;
 
 import 'dart:async';
 import 'dart:typed_data';
@@ -10,4 +10,4 @@ import 'package:observatory/models.dart' as M;
 import 'package:observatory/service.dart';
 import 'package:observatory/utils.dart';
 
-part 'src/cpu_profile/cpu_profile.dart';
+part 'src/sample_profile/sample_profile.dart';