Removed Polymer from Observatory deps

packages/polymer_expressions/benchmark/all.dart

Index: packages/polymer_expressions/benchmark/all.dart
diff --git a/packages/polymer_expressions/benchmark/all.dart b/packages/polymer_expressions/benchmark/all.dart
deleted file mode 100644
index 2aaabca42fa686d561f1ae800622da1d161ce77f..0000000000000000000000000000000000000000
--- a/packages/polymer_expressions/benchmark/all.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_expressions.benchmark.all;
-
-import 'parse.dart' as parse;
-import 'eval.dart' as eval;
-
-main() {
-  parse.main();
-  eval.main();
-}