Update Polymer components.

third_party/polymer/components/iron-form/.bower.json

Index: third_party/polymer/components/iron-form/.bower.json
diff --git a/third_party/polymer/components/iron-form/.bower.json b/third_party/polymer/components/iron-form/.bower.json
index 08bd93474e418647e3360fbf458d3e7c2d0b6eca..7bb7826ed3001532eb9c713ac977ae15f7a695d2 100644
--- a/third_party/polymer/components/iron-form/.bower.json
+++ b/third_party/polymer/components/iron-form/.bower.json
@@ -1,6 +1,6 @@
 {
   "name": "iron-form",
-  "version": "1.1.5",
+  "version": "1.1.6",
   "description": "Makes it easier to manage forms",
   "keywords": [
     "web-components",
@@ -39,11 +39,11 @@
     "web-component-tester": "^4.0.0",
     "webcomponentsjs": "^0.7.0"
   },
-  "_release": "1.1.5",
+  "_release": "1.1.6",
   "_resolution": {
     "type": "version",
-    "tag": "v1.1.5",
-    "commit": "5b3dcd86efa64d23424e8180ce2568767fd6d525"
+    "tag": "v1.1.6",
+    "commit": "ee811a70dfd47c8918212b23247f1ae3e798497b"
   },
   "_source": "https://github.com/PolymerElements/iron-form.git",
   "_target": "^1.0.0",