Removed Polymer from Observatory deps

packages/js/lib/src/varargs.dart

-// Copyright (c) 2015, 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.
-
-/// Declarations for variable arguments support
-/// (rest params and spread operator).
-///
-/// These are currently *not* supported by dart2js or Dartium.
-library js.varargs;
-
-class _Rest {
-  const _Rest();
-}
-
-/// Annotation to tag ES6 rest parameters (https://goo.gl/r0bJ1K).
-///
-/// This is *not* supported by dart2js or Dartium (yet).
-///
-/// This is meant to be used by the Dart Dev Compiler
-/// when compiling helper functions of its runtime to ES6.
-///
-/// The following function:
-///
-///     foo(a, b, @rest others) { ... }
-///
-/// Will be compiled to ES6 code like the following:
-///
-///     function foo(a, b, ...others) { ... }
-///
-/// Which is roughly equivalent to the following ES5 code:
-///
-///     function foo(a, b/*, ...others*/) {
-///       var others = [].splice.call(arguments, 2);
-///       ...
-///     }
-///
-const _Rest rest = const _Rest();
-
-/// Intrinsic function that maps to the ES6 spread operator
-/// (https://goo.gl/NedHKr).
-///
-/// This is *not* supported by dart2js or Dartium (yet),
-/// and *cannot* be called at runtime.
-///
-/// This is meant to be used by the Dart Dev Compiler when
-/// compiling its runtime to ES6.
-///
-/// The following expression:
-///
-///     foo(a, b, spread(others))
-///
-/// Will be compiled to ES6 code like the following:
-///
-///     foo(a, b, ...others)
-///
-/// Which is roughly equivalent to the following ES5 code:
-///
-///     foo.apply(null, [a, b].concat(others))
-///
-dynamic spread(args) {
-  throw new StateError(
-      'The spread function cannot be called, '
-      'it should be compiled away.');
-}