build: fix screenshot golden upload (#4128)

* Fixes the Google Cloud Storage upload for the goldens.

The issue seems to happen because the `@google-cloud/storage` package has been installed manually and the `google-cloud` now uses a different storage version than before. Noticed this while debugging the `google-cloud` package.

package.json

@@ -68,7 +68,6 @@
     "fs-extra": "^2.0.0",
     "glob": "^7.1.1",
     "google-closure-compiler": "^20170218.0.0",
-    "google-cloud": "^0.48.0",
     "gulp": "^3.9.1",
     "gulp-clean": "^0.3.2",
     "gulp-clean-css": "^3.0.3",

tools/gulp/util/firebase.ts

@@ -1,6 +1,6 @@
 const firebaseAdmin = require('firebase-admin');
 const firebase = require('firebase');
-const gcloud = require('google-cloud');
+const cloudStorage = require('@google-cloud/storage');
 
 const config = require('../../../functions/config.json');
 
@@ -27,7 +27,7 @@ export function openFirebaseDashboardDatabase() {
  * The files uploaded to google cloud are also available to firebase storage.
  */
 export function openScreenshotsBucket() {
-  let gcs = gcloud.storage({
+  let gcs = cloudStorage({
     projectId: 'material2-screenshots',
     credentials: {
       client_email: 'firebase-adminsdk-t4209@material2-screenshots.iam.gserviceaccount.com',