Clear analyzer warning on Observatory

runtime/observatory/tests/service/get_allocation_samples_test.dart

Index: runtime/observatory/tests/service/get_allocation_samples_test.dart
diff --git a/runtime/observatory/tests/service/get_allocation_samples_test.dart b/runtime/observatory/tests/service/get_allocation_samples_test.dart
index ae773eb261962b26e5aaa72c92e70cae6c723f83..239fab554062231f3d03fb3f857dce978ad60536 100644
--- a/runtime/observatory/tests/service/get_allocation_samples_test.dart
+++ b/runtime/observatory/tests/service/get_allocation_samples_test.dart
@@ -6,7 +6,7 @@
 import 'dart:developer';
 import 'package:observatory/models.dart' as M;
 import 'package:observatory/service_io.dart';
-import 'package:observatory/cpu_profile.dart';
+import 'package:observatory/sample_profile.dart';
 import 'package:unittest/unittest.dart';
 import 'service_test_common.dart';
 import 'test_helper.dart';
@@ -61,7 +61,7 @@ var tests = [
     await fooClass.setTraceAllocations(false);
     await fooClass.reload();
     expect(fooClass.traceAllocations, isFalse);
-    CpuProfile cpuProfile = new CpuProfile();
+    SampleProfile cpuProfile = new SampleProfile();
     await cpuProfile.load(isolate, profileResponse);
     cpuProfile.buildCodeCallerAndCallees();
     cpuProfile.buildFunctionCallerAndCallees();