Update Polymer components.

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

Index: third_party/polymer/components/iron-behaviors/.bower.json
diff --git a/third_party/polymer/components/iron-behaviors/.bower.json b/third_party/polymer/components/iron-behaviors/.bower.json
index 1b258161f86247c52ac239f3e76a14abb9065c4c..3eaafb4b32748da7c18bbab08152f7aa897ce42f 100644
--- a/third_party/polymer/components/iron-behaviors/.bower.json
+++ b/third_party/polymer/components/iron-behaviors/.bower.json
@@ -1,6 +1,6 @@
 {
   "name": "iron-behaviors",
-  "version": "1.0.17",
+  "version": "1.0.18",
   "description": "Provides a set of behaviors for the iron elements",
   "private": true,
   "authors": [
@@ -29,14 +29,14 @@
     "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0"
   },
   "ignore": [],
-  "homepage": "https://github.com/PolymerElements/iron-behaviors",
-  "_release": "1.0.17",
+  "homepage": "https://github.com/polymerelements/iron-behaviors",
+  "_release": "1.0.18",
   "_resolution": {
     "type": "version",
-    "tag": "v1.0.17",
-    "commit": "ef8e89b5f0aa4e8a6b51ca6491ea453bf395f94f"
+    "tag": "v1.0.18",
+    "commit": "7c07f18d747aee2c31330511ae8f780554ff98d8"
   },
-  "_source": "https://github.com/PolymerElements/iron-behaviors.git",
+  "_source": "https://github.com/polymerelements/iron-behaviors.git",
   "_target": "^1.0.0",
-  "_originalSource": "PolymerElements/iron-behaviors"
+  "_originalSource": "polymerelements/iron-behaviors"
 }