Port downloads.ItemView to a Polymer component.

ui/webui/resources/js/i18n_template_no_process.js

Index: ui/webui/resources/js/i18n_template_no_process.js
diff --git a/ui/webui/resources/js/i18n_template_no_process.js b/ui/webui/resources/js/i18n_template_no_process.js
index 44262810b0328671273ec433f4b6a5b0f2c24496..4e7a7df6da2b545cc9e22e233bf4a312c418a103 100644
--- a/ui/webui/resources/js/i18n_template_no_process.js
+++ b/ui/webui/resources/js/i18n_template_no_process.js
@@ -111,14 +111,7 @@ var i18nTemplate = (function() {
   };
 
   var attributeNames = Object.keys(handlers);
-  // Chrome for iOS must use Apple's UIWebView, which (as of April 2015) does
-  // not have native shadow DOM support. If shadow DOM is supported (or
-  // polyfilled), search for i18n attributes using the /deep/ selector;
-  // otherwise, do not attempt to search within the shadow DOM.
-  var selector =
-      (window.document.body && window.document.body.createShadowRoot) ?
-      'html /deep/ [' + attributeNames.join('],[') + ']' :
-      '[' + attributeNames.join('],[') + ']';
+  var selector = '[' + attributeNames.join('],[') + ']';
 
   /**
    * Processes a DOM tree with the {@code dictionary} map.
@@ -136,7 +129,7 @@ var i18nTemplate = (function() {
       }
     }
     var doc = root instanceof Document ? root : root.ownerDocument;
-    if (doc)
+    if (doc && doc.documentElement)
       doc.documentElement.classList.add('i18n-processed');
   }