Add incognito:split to Chrome Connectivity Diagnostics app

BUG=346862

Review URL: https://codereview.chromium.org/181063036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255261 0039d316-1c4b-4281-b951-d872f2087c98

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

 {
   "key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDGJWLUb83WKoDeODlrPIZu60M8bzbvrkg3Jf/5aO3ux2FL+G+/BO4Vyt/J0t8lXBtnTOvHo6KPpA042PyE9xMdlufFnJqEkvPXNzRlBWeVQqFHbMWE6o/x8diG69dNmHyFYcUjjFFDk2X2GOLQXNUGJQ6MIikbdzoWdLGttmhAIwIDAQAB",
   "manifest_version": 2,
+  "incognito" : "split",
   "name": "Connectivity Diagnostics",
   "version": "1.1.0",
   "minimum_chrome_version": "29",

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

 {
   "key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDOg+/GcwTYomV06ymtKpD08+M7qjbINqbvPUT/+RFdGm30vVIWivqIrFuiXr+h8d77yTUHcpkRa4LEMulsG2Q44SWfWhBZOVnohsu/OUdHKZ+nw82Q0G+4jjkVOz3/AvUBCBwBaL90Jn05hockJriLAvNUWKLheirw58BVzF9z9wIDAQAB",
   "manifest_version": 2,
+  "incognito" : "split",
   "name": "NCDLauncher",
   "version": "1",
   "minimum_chrome_version": "27",