Update Polymer components.

third_party/polymer/components/paper-item/.bower.json

Index: third_party/polymer/components/paper-item/.bower.json
diff --git a/third_party/polymer/components/paper-item/.bower.json b/third_party/polymer/components/paper-item/.bower.json
index 91f23cd974584cfc4a5a0e5e8c76ffd2e365db89..2b408482c0c712f51b00cbc70df07133ae21971c 100644
--- a/third_party/polymer/components/paper-item/.bower.json
+++ b/third_party/polymer/components/paper-item/.bower.json
@@ -1,6 +1,6 @@
 {
   "name": "paper-item",
-  "version": "1.2.1",
+  "version": "1.2.2",
   "description": "A material-design styled list item",
   "authors": [
     "The Polymer Authors"
@@ -40,13 +40,13 @@
     "webcomponentsjs": "webcomponents/webcomponentsjs#^0.7.0",
     "iron-test-helpers": "PolymerElements/iron-test-helpers#^1.0.0"
   },
-  "_release": "1.2.1",
+  "_release": "1.2.2",
   "_resolution": {
     "type": "version",
-    "tag": "v1.2.1",
-    "commit": "1eab91333b318ae19e315866575b2dddd38e6abc"
+    "tag": "v1.2.2",
+    "commit": "d8277ec6bea4a1b1b718737d0e9391f72d278128"
   },
-  "_source": "git://github.com/PolymerElements/paper-item.git",
+  "_source": "https://github.com/PolymerElements/paper-item.git",
   "_target": "^1.0.0",
   "_originalSource": "PolymerElements/paper-item"
 }