Minor fixes in FieldTrial.

- Add a DCHECK
- Comment what the return value is on AddGroup
- const a member
- Typo fix

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/6577038

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@76061 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: 9238ab93a4ba8bfc555e429308a68a53a1b9feda
2 files changed
tree: 2c6493fe01f8016b2b044259da991c79a68b1ced
  1. base/
  2. build/
  3. ipc/
  4. testing/