Remove Chromium's custom closure runner.

third_party/closure_compiler/externs/polymer-1.0.js

Index: third_party/closure_compiler/externs/polymer-1.0.js
diff --git a/third_party/closure_compiler/externs/polymer-1.0.js b/third_party/closure_compiler/externs/polymer-1.0.js
index 9c314d0c1a1e32dfa6d2b0af7612cee7a0a8dab2..f3113ebf0653b76951000c7df23e8e278e74cc42 100644
--- a/third_party/closure_compiler/externs/polymer-1.0.js
+++ b/third_party/closure_compiler/externs/polymer-1.0.js
@@ -1355,6 +1355,14 @@ Polymer.Iconset = function() {};
 Polymer.Iconset.prototype.applyIcon = function(
       element, icon, theme, scale) {};
 
+/**
+ * Remove an icon from the given element by undoing the changes effected
+ * by `applyIcon`.
+ *
+ * @param {Element} element The element from which the icon is removed.
+ */
+Polymer.Iconset.prototype.removeIcon = function(element) {};
+
 Polymer.ResolveUrl = {};
 
 /**