Mash: Replaces "exe:chrome" with "service:content_browser"

chrome/app/mash/chrome_mash_manifest.json

 {
+  // NOTE: This is the manifest for exe:chrome_mash, which is only used to
+  // package services for the Mash environment. If you need to require or
+  // provide capabilities from Chrome itself within the Mash environment, modify
+  // chrome_mash_content_browser_manifest_overlay.json instead.
   "manifest_version": 1,
   "name": "exe:chrome_mash",
-  "display_name": "Chrome",
+  "display_name": "Chrome Mash Packaged Services",
   "capabilities": {
     "required": {
-      "*": { "classes": [ "app" ] }
+      "service:mash_session": { "classes": [ "app" ] },
+      "service:shell": { "classes": [ "control" ] },
+      "service:catalog": { "classes": [ "control" ] }
     }
   }
 }