Remove --allow-request-os-file-handle option

We don't need whitelist anymore thanks to
https://chromiumcodereview.appspot.com/13508005

TEST=browser_tests, trybots
BUG=224753

Review URL: https://chromiumcodereview.appspot.com/13923007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@196110 0039d316-1c4b-4281-b951-d872f2087c98
9 files changed