Fix dart2js int double test failure

tests/lib/profiler/metrics_num_test.dart

Index: tests/lib/profiler/metrics_num_test.dart
diff --git a/tests/language/const_switch2_test.dart b/tests/lib/profiler/metrics_num_test.dart
similarity index 57%
copy from tests/language/const_switch2_test.dart
copy to tests/lib/profiler/metrics_num_test.dart
index 73728999353c1586d45a293b29d14a5b8744d86c..65126920848516f7025280387566e06e721b8932 100644
--- a/tests/language/const_switch2_test.dart
+++ b/tests/lib/profiler/metrics_num_test.dart
@@ -1,15 +1,18 @@
 // Copyright (c) 2014, 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.
+//
 
+import 'dart:profiler';
 import 'package:expect/expect.dart';
 
-int main() {
-  var a = [1,2,3][2];
-  switch (a) {
-    case 0.0:            /// 01: compile-time error
-      print("illegal");  /// 01: continued
-    case 1:
-      print("OK");
-  }
-}
+testGaugeDouble() {
+  Expect.throws(() {
+    // max is not a double

[sra1, 2014/08/01 00:53:22]

I'm immediately sure what max is.
Maybe change these comments to say:
// `max` argument is not double.

+    gauge = new Gauge('test', 'alpha bravo', 1.0, 4);
+  });
+}
+
+main() {
+  testGaugeDouble();
+}