[third_party] add polymer 1.2.3

polymer_1.2.3/bower_components/iron-test-helpers/bower.json

Index: polymer_1.2.3/bower_components/iron-test-helpers/bower.json
diff --git a/polymer_1.0.4/bower_components/iron-test-helpers/bower.json b/polymer_1.2.3/bower_components/iron-test-helpers/bower.json
similarity index 91%
copy from polymer_1.0.4/bower_components/iron-test-helpers/bower.json
copy to polymer_1.2.3/bower_components/iron-test-helpers/bower.json
index 4b3f5f32f3c70bb6a51e39c454eab2737a88b619..7c814762828b5767e53cafd20f1ab73cfb3a4123 100644
--- a/polymer_1.0.4/bower_components/iron-test-helpers/bower.json
+++ b/polymer_1.2.3/bower_components/iron-test-helpers/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "iron-test-helpers",
-  "version": "1.0.1",
+  "version": "1.1.3",
   "authors": [
     "The Polymer Authors"
   ],
@@ -24,5 +24,6 @@
   },
   "devDependencies": {
     "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0"
-  }
+  },
+  "main": "iron-test-helpers.html"
 }