Switch to using pub build instead of custom build_.dart script

runtime/bin/vmservice/client/deployed/web/packages/shadow_dom/src/platform/patches-shadowdom-polyfill.js

Index: runtime/bin/vmservice/client/deployed/web/packages/shadow_dom/src/platform/patches-shadowdom-polyfill.js
diff --git a/pkg/web_components/lib/dart_support.js b/runtime/bin/vmservice/client/deployed/web/packages/shadow_dom/src/platform/patches-shadowdom-polyfill.js
similarity index 58%
copy from pkg/web_components/lib/dart_support.js
copy to runtime/bin/vmservice/client/deployed/web/packages/shadow_dom/src/platform/patches-shadowdom-polyfill.js
index 44b5a38cad1912c75ad8e8b5be586d05e845aa86..a5749abba1b791461572c85ecd259b54b1461d09 100644
--- a/pkg/web_components/lib/dart_support.js
+++ b/runtime/bin/vmservice/client/deployed/web/packages/shadow_dom/src/platform/patches-shadowdom-polyfill.js
@@ -1,18 +1,29 @@
-// 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.
-
+/*
+ * Copyright 2013 The Polymer Authors. 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 ShadowDOMPolyfill = window.ShadowDOMPolyfill;
-  if (!ShadowDOMPolyfill) return;
+  var wrap = ShadowDOMPolyfill.wrap;
+
+  // patch in prefixed name
+  Object.defineProperties(HTMLElement.prototype, {
+    //TODO(sjmiles): review accessor alias with Arv
+    webkitShadowRoot: {
+      get: function() {
+        return this.shadowRoot;
+      }
+    }
+  });
 
-  if (navigator.userAgent.indexOf('(Dart)') !== -1) {
-    console.error("ShadowDOMPolyfill polyfill was loaded in Dartium. This " +
-        "will not work. This indicates that Dartium's Chrome version is " +
-        "not compatible with this version of web_components.");
-  }
+  // ShadowCSS needs this:
+  window.wrap = window.ShadowDOMPolyfill.wrap;
+  window.unwrap = window.ShadowDOMPolyfill.unwrap;
 
-  var needsConstructorFix = window.constructor === window.Window;
+  //TODO(sjmiles): review method alias with Arv
+  HTMLElement.prototype.webkitCreateShadowRoot =
+      HTMLElement.prototype.createShadowRoot;
 
   // TODO(jmesserly): we need to wrap document somehow (a dart:html hook?)
   window.dartExperimentalFixupGetTag = function(originalGetTag) {
@@ -23,9 +34,9 @@
       // TODO(jmesserly): do we still need these?
       if (obj instanceof NodeList) return 'NodeList';
       if (obj instanceof ShadowRoot) return 'ShadowRoot';
-      if (MutationRecord && (obj instanceof MutationRecord))
+      if (window.MutationRecord && (obj instanceof MutationRecord))
           return 'MutationRecord';
-      if (MutationObserver && (obj instanceof MutationObserver))
+      if (window.MutationObserver && (obj instanceof MutationObserver))
           return 'MutationObserver';
 
       // TODO(jmesserly): this prevents incorrect interaction between ShadowDOM
@@ -36,10 +47,11 @@
       if (obj instanceof HTMLTemplateElement) return 'HTMLTemplateElement';
 
       var unwrapped = unwrapIfNeeded(obj);
-      if (unwrapped && (needsConstructorFix || obj !== unwrapped)) {
-        // Fix up class names for Firefox, or if using the minified polyfill.
-        // dart2js prefers .constructor.name, but there are all kinds of cases
-        // where this will give the wrong answer.
+      if (obj !== unwrapped) {
+        // Fix up class names for Firefox.
+        // For some of them (like HTMLFormElement and HTMLInputElement),
+        // the "constructor" property of the unwrapped nodes points at the
+        // same constructor as the wrapper.
         var ctor = obj.constructor
         if (ctor === unwrapped.constructor) {
           var name = ctor._ShadowDOMPolyfill$cacheTag_;