Roll Polymer to 1.3.1

third_party/polymer/v1_0/components-chromium/paper-tabs/bower.json

 {
   "name": "paper-tabs",
-  "version": "1.3.3",
+  "version": "1.3.7",
   "license": "http://polymer.github.io/LICENSE.txt",
   "description": "Material design tabs",
   "private": true,
   "main": "paper-tabs.html",
   "authors": [
     "The Polymer Authors"
   ],
   "keywords": [
     "web-components",
     "polymer",
     "tabs",
     "control"
   ],
   "repository": {
     "type": "git",
     "url": "git://github.com/PolymerElements/paper-tabs.git"
   },
   "dependencies": {
     "iron-behaviors": "PolymerElements/iron-behaviors#^1.0.0",
     "iron-flex-layout": "PolymerElements/iron-flex-layout#^1.0.0",
     "iron-icon": "PolymerElements/iron-icon#^1.0.0",
     "iron-iconset-svg": "PolymerElements/iron-iconset-svg#^1.0.0",
-    "iron-menu-behavior": "PolymerElements/iron-menu-behavior#^1.0.0",
+    "iron-menu-behavior": "PolymerElements/iron-menu-behavior#^1.1.0",
     "iron-resizable-behavior": "PolymerElements/iron-resizable-behavior#^1.0.0",
     "paper-behaviors": "PolymerElements/paper-behaviors#^1.0.0",
     "paper-icon-button": "PolymerElements/paper-icon-button#^1.0.0",
     "paper-styles": "PolymerElements/paper-styles#^1.0.0",
     "polymer": "Polymer/polymer#^1.1.0"
   },
   "devDependencies": {
     "iron-component-page": "PolymerElements/iron-component-page#^1.0.0",
     "iron-demo-helpers": "PolymerElements/iron-demo-helpers#^1.0.0",
     "iron-pages": "PolymerElements/iron-pages#^1.0.0",
     "iron-test-helpers": "PolymerElements/iron-test-helpers#^1.0.0",
     "paper-toolbar": "PolymerElements/paper-toolbar#^1.0.0",
     "test-fixture": "PolymerElements/test-fixture#^1.0.0",
     "web-component-tester": "^4.0.0",
     "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0"
   },
   "ignore": []
 }