Update Polymer components.

third_party/polymer/components/polymer/.bower.json

Index: third_party/polymer/components/polymer/.bower.json
diff --git a/third_party/polymer/components/polymer/.bower.json b/third_party/polymer/components/polymer/.bower.json
index 09eb6b083d60a2bc3acb98f27d5dd6b7d028612f..70407680608317401524ea8daf735d1dc1702ceb 100644
--- a/third_party/polymer/components/polymer/.bower.json
+++ b/third_party/polymer/components/polymer/.bower.json
@@ -1,6 +1,6 @@
 {
   "name": "polymer",
-  "version": "1.8.1",
+  "version": "1.9.3",
   "main": [
     "polymer.html",
     "polymer-mini.html",
@@ -33,13 +33,13 @@
   },
   "private": true,
   "homepage": "https://github.com/Polymer/polymer",
-  "_release": "1.8.1",
+  "_release": "1.9.3",
   "_resolution": {
     "type": "version",
-    "tag": "v1.8.1",
-    "commit": "d89302fc3755b04ad4171f431e719a08b5b816f3"
+    "tag": "v1.9.3",
+    "commit": "cb9e67b885f48731b31ddcec02d841dac6d5982e"
   },
   "_source": "https://github.com/Polymer/polymer.git",
-  "_target": "^1.5.0",
+  "_target": "^1.0.0",
   "_originalSource": "Polymer/polymer"
 }