Remove localhost from Hangouts services extension manifest.

Bug: 819406
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I9ec4028146c3a561f847a649848c5c16dde6e2a8
Reviewed-on: https://chromium-review.googlesource.com/951684Reviewed-by: Patrik Höglund <phoglund@chromium.org>
Commit-Queue: Henrik Grunell <grunell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544656}

chrome/browser/resources/hangout_services/manifest.json

@@ -9,9 +9,7 @@
   "manifest_version": 2,
   "externally_connectable": {
     "matches": [
-      "https://*.google.com/*",
-      // For tests.
-      "*://localhost/*"
+      "https://*.google.com/*"
     ]
   },
   "background": {