Roll third_party/polymer.

third_party/polymer/v1_0/components-chromium/paper-dialog-behavior/bower.json

 {
   "name": "paper-dialog-behavior",
-  "version": "1.2.0",
+  "version": "1.2.5",
   "description": "Implements a behavior used for material design dialogs",
   "authors": "The Polymer Authors",
   "keywords": [
     "web-components",
     "polymer",
     "dialog",
     "overlay",
     "behavior"
   ],
   "main": "paper-dialog-behavior.html",
   "private": true,
   "repository": {
     "type": "git",
     "url": "git://github.com/PolymerElements/paper-dialog-behavior"
   },
   "license": "http://polymer.github.io/LICENSE.txt",
   "homepage": "https://github.com/PolymerElements/paper-dialog-behavior",
   "ignore": [],
   "dependencies": {
     "iron-overlay-behavior": "PolymerElements/iron-overlay-behavior#^1.0.0",
     "paper-styles": "PolymerElements/paper-styles#^1.1.0",
     "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-test-helpers": "PolymerElements/iron-test-helpers#^1.0.0",
     "paper-button": "PolymerElements/paper-button#^1.0.0",
     "paper-dialog-scrollable": "PolymerElements/paper-dialog-scrollable#^1.0.0",
+    "paper-dropdown-menu": "PolymerElements/paper-dropdown-menu#^1.0.0",
     "paper-icon-button": "PolymerElements/paper-icon-button#^1.0.0",
+    "paper-item": "PolymerElements/paper-item#^1.0.0",
+    "paper-listbox": "PolymerElements/paper-listbox#^1.0.0",
     "web-component-tester": "^4.0.0",
     "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0"
   }
 }