Fix manifest's externally_connectable to use the correct Hangouts URL

remoting/webapp/crd/manifest.json.jinja2

 {
   {{ MANIFEST_KEY_FOR_UNOFFICIAL_BUILD }}
   "name": "__MSG_PRODUCT_NAME__",
   "version": "{{ FULL_APP_VERSION }}",
   "description": "__MSG_PRODUCT_DESCRIPTION__",
   "manifest_version": 2,
   "default_locale": "en",
   "minimum_chrome_version": "32",
   "app": {
 {% if webapp_type == 'v1' %}
@@ skipping 44 matching lines @@
     "scopes": [
       "https://www.googleapis.com/auth/chromoting https://www.googleapis.com/auth/googletalk https://www.googleapis.com/auth/userinfo#email"
     ]
   },
   "sandbox": {
     "pages": [ "wcs_sandbox.html" ]
   },
 {% endif %}
   "externally_connectable": {
     "matches": [
-        "https://*.talkgadget.google.com/*"
+        "https://*.google.com/hangouts*"
     ]
   },
   "permissions": [
     "{{ OAUTH2_ACCOUNTS_HOST }}/*",
     "{{ OAUTH2_API_BASE_URL }}/*",
     "{{ DIRECTORY_API_BASE_URL }}/*",
     "{{ TALK_GADGET_HOST }}/talkgadget/*",
     "https://relay.google.com/*",
     "storage",
     "clipboardRead",
@@ skipping 15 matching lines @@
         "udp-send-to",
         "udp-bind",
         "udp-multicast-membership",
         "resolve-host",
         "network-state"
       ]
     }
 {% endif %}
   ]
 }