Removed Polymer from Observatory deps

packages/polymer/test/build/static_clean_test.dart

Index: packages/polymer/test/build/static_clean_test.dart
diff --git a/packages/polymer/test/build/static_clean_test.dart b/packages/polymer/test/build/static_clean_test.dart
deleted file mode 100644
index 2fa62a9120f5cfa5efa6a4253e63f70014e8fb83..0000000000000000000000000000000000000000
--- a/packages/polymer/test/build/static_clean_test.dart
+++ /dev/null
@@ -1,13 +0,0 @@
-// 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 polymer.test.build.static_clean_test;
-
-import 'package:polymer/builder.dart';
-
-_unused() => build;
-
-void main() {
-  // Check that builder.dart is statically clean. Nothing to do.
-}