[third_party] add polymer 1.2.3

polymer_1.2.3/bower_components/iron-icon/.bower.json

 {
   "name": "iron-icon",
   "private": true,
-  "version": "1.0.2",
+  "version": "1.0.7",
   "license": "http://polymer.github.io/LICENSE.txt",
   "description": "An element that supports displaying an icon",
   "main": "iron-icon.html",
   "author": [
     "The Polymer Authors"
   ],
   "keywords": [
     "web-components",
     "polymer",
     "icon"
   ],
   "repository": {
     "type": "git",
     "url": "git://github.com/PolymerElements/iron-icon.git"
   },
   "dependencies": {
     "iron-flex-layout": "polymerelements/iron-flex-layout#^1.0.0",
     "iron-meta": "polymerelements/iron-meta#^1.0.0",
     "polymer": "Polymer/polymer#^1.0.0"
   },
   "devDependencies": {
     "test-fixture": "polymerelements/test-fixture#^1.0.0",
+    "promise-polyfill": "polymerlabs/promise-polyfill#^1.0.0",
     "iron-iconset": "polymerelements/iron-iconset#^1.0.0",
     "iron-icons": "polymerelements/iron-icons#^1.0.0",
     "iron-component-page": "polymerelements/iron-component-page#^1.0.0",
     "web-component-tester": "*",
     "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0"
   },
   "homepage": "https://github.com/PolymerElements/iron-icon",
-  "_release": "1.0.2",
+  "_release": "1.0.7",
   "_resolution": {
     "type": "version",
-    "tag": "v1.0.2",
-    "commit": "f9246c47ecb1c682f0fb9ea48255d5f7debd1e03"
+    "tag": "v1.0.7",
+    "commit": "6f4d152dc3998a6cc12a5a585a654f893dc99381"
   },
   "_source": "git://github.com/PolymerElements/iron-icon.git",
   "_target": "^1.0.0",
   "_originalSource": "PolymerElements/iron-icon"
 }