Give chromevox access to the commandLinePrivate API on chromeos.

BUG=225886
R=zelidrag@chromium.org

Review URL: https://codereview.chromium.org/130503010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245642 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/chromeos/chromevox/manifest.json

@@ -15,6 +15,7 @@
     "tts",
     "systemPrivate",
     "brailleDisplayPrivate",
+    "commandLinePrivate",
     "<all_urls>"
   ],
   "content_scripts": [