Prune the old deploy code. This CL does a few changes:

pkg/polymer/lib/testing/testing.js

 // Copyright (c) 2012, 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.
 
 (function() {
   var undoReplaceScripts = [];
 
   var flags = {};
   // populate flags from location
   location.search.slice(1).split('&').forEach(function(o) {
@@ skipping 53 matching lines @@
       // Remove JS interop dart-port attributes,
       if (node.tagName == 'HTML' && node.attributes) {
         for (var i = node.attributes.length; i--; i >= 0) {
           var attrNode = node.attributes[i];
           if (attrNode && attrNode.name.indexOf('dart-port:') == 0) {
             node.removeAttributeNode(attrNode);
           }
         }
       }
 
+      // We remove the contents of style tags so that we can compare both runs
+      // with and without the runtmie css shim. We keep the STYLE right under
+      // HEAD, because it is not affected by the shim.
+      if (node.tagName == 'STYLE') {
+        if (node.attributes['shadowcssshim'] != null) {
+          node.parentNode.removeChild(node);
+        } else if (node.parentNode.tagName != "HEAD") {
+          node.textContent = '/* style hidden by testing.js */'
+        }
+      }
+
       if (node.tagName == 'SCRIPT') {
         if (node.textContent.indexOf('_DART_TEMPORARY_ATTACHED') >= 0)  {
           node.parentNode.removeChild(node);
         } else {
           // Remove the JS Interop script.
           var typeAttr = node.getAttributeNode("type");
           if (typeAttr && typeAttr.value == "text/javascript") {
             if (node.textContent.indexOf(
                 "(function() {\n  // Proxy support for js.dart.\n\n") == 0) {
               node.parentNode.removeChild(node);
@@ skipping 71 matching lines @@
               parent.replaceChild(script, jsScript);
             });
             parent.replaceChild(jsScript, script);
           }
         }
       }
     }, false);
   }
 
 })();