update builds and WCT depdendency.

Author: Steven Orvell

bower.json

@@ -20,7 +20,7 @@
   "license": "BSD-3-Clause",
   "ignore": [],
   "devDependencies": {
-    "web-component-tester": "^v6.0.0-prerelease.7",
+    "web-component-tester": "^v6.0.0-prerelease.9",
     "custom-elements": "webcomponents/custom-elements#^v1.0.0-rc.1",
     "es6-promise": "stefanpenner/es6-promise#^4.0.0",
     "html-imports": "webcomponents/html-imports#^v1.0.0-rc.2",

externs/webcomponents.js

@@ -18,6 +18,5 @@ var define;
 var module;
 var exports;
 
-var customElements;
 var ShadyDOM;
 var WebComponents;

package.json

@@ -31,7 +31,7 @@
     "bower": "^1.8.0",
     "del": "^2.2.2",
     "eslint": "^3.16.1",
-    "google-closure-compiler": "^20170218.0.0",
+    "google-closure-compiler": "^20170409.0.0",
     "gulp": "^3.8.8",
     "gulp-rename": "^1.2.2",
     "gulp-sourcemaps": "^2.4.1",