use ShadowCSS directly

pkg/shadow_dom/lib/src/platform/patches-shadow-css.js

Index: pkg/shadow_dom/lib/src/platform/patches-shadow-css.js
diff --git a/pkg/shadow_dom/lib/src/platform/patches-shadow-css.js b/pkg/shadow_dom/lib/src/platform/patches-shadow-css.js
deleted file mode 100644
index 952557070a4aaeed351b9f937c48fb1ae5a3064b..0000000000000000000000000000000000000000
--- a/pkg/shadow_dom/lib/src/platform/patches-shadow-css.js
+++ /dev/null
@@ -1,65 +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.
-
-(function(scope) {
-  // TODO(terry): Remove shimShadowDOMStyling2 until wrap/unwrap from a
-  //              dart:html Element to a JS DOM node is available.
-  /**
-   * Given the content of a STYLE tag and the name of a component shim the CSS
-   * and return the new scoped CSS to replace the STYLE's content.  The content
-   * is replaced in Dart's implementation of PolymerElement.
-   */
-  function shimShadowDOMStyling2(styleContent, name) {
-    if (window.ShadowDOMPolyfill) {
-      var content = this.convertPolyfillDirectives(styleContent, name);
-
-      // applyShimming calls shimAtHost and shipScoping
-      // shimAtHost code:
-      var r = '', l=0, matches;
-      while (matches = hostRuleRe.exec(content)) {
-        r += content.substring(l, matches.index);
-        r += this.scopeHostCss(matches[1], name);
-        l = hostRuleRe.lastIndex;
-      }
-      r += content.substring(l, content.length);
-      var re = new RegExp('^' + name + selectorReSuffix, 'm');
-      var atHostCssText = rulesToCss(this.findAtHostRules(cssToRules(r), re));
-
-      // shimScoping code:
-      // strip comments for easier processing
-      content = content.replace(cssCommentRe, '');
-
-      content = this.convertPseudos(content);
-      var rules = cssToRules(content);
-      var cssText = this.scopeRules(rules, name);
-
-      return atHostCssText + cssText;
-    }
-  }
-
-  // Minimal copied code from ShadowCSS, that is not exposed in
-  // PlatForm.ShadowCSS (local code).
-  var hostRuleRe = /@host[^{]*{(([^}]*?{[^{]*?}[\s\S]*?)+)}/gim,
-    cssCommentRe = /\/\*[^*]*\*+([^/*][^*]*\*+)*\//gim,
-    selectorReSuffix = '([>\\s~+\[.,{:][\\s\\S]*)?$';
-
-  function cssToRules(cssText) {
-    var style = document.createElement('style');
-    style.textContent = cssText;
-    document.head.appendChild(style);
-    var rules = style.sheet.cssRules;
-    style.parentNode.removeChild(style);
-    return rules;
-  }
-
-  function rulesToCss(cssRules) {
-    for (var i=0, css=[]; i < cssRules.length; i++) {
-      css.push(cssRules[i].cssText);
-    }
-    return css.join('\n\n');
-  }
-
-  // exports
-  scope.ShadowCSS.shimShadowDOMStyling2 = shimShadowDOMStyling2;
-})(window.Platform);