Fix Polymer's Chrome-specific patch

third_party/polymer/v1_0/components-chromium/polymer/polymer-extracted.js

Index: third_party/polymer/v1_0/components-chromium/polymer/polymer-extracted.js
diff --git a/third_party/polymer/v1_0/components-chromium/polymer/polymer-extracted.js b/third_party/polymer/v1_0/components-chromium/polymer/polymer-extracted.js
index 9c252a15a67ab90d275752755ea1c7e53d93fa3f..cc3286d43f2b9bf931d79abfc60f600a525b7a50 100644
--- a/third_party/polymer/v1_0/components-chromium/polymer/polymer-extracted.js
+++ b/third_party/polymer/v1_0/components-chromium/polymer/polymer-extracted.js
@@ -2495,7 +2495,8 @@ _hasMixinRules: function (rules) {
 return rules[0].selector.indexOf(this.VAR_START) === 0;
 },
 removeCustomProps: function (cssText) {
-return cssText;
+cssText = this.removeCustomPropAssignment(cssText);
+return this.removeCustomPropApply(cssText);
 },
 removeCustomPropAssignment: function (cssText) {
 return cssText.replace(this._rx.customProp, '').replace(this._rx.mixinProp, '');