Mark OnceCallback::Run() & const so it matches a const callback object.

BUG=675328

Review-Url: https://codereview.chromium.org/2583343002
Cr-Commit-Position: refs/heads/master@{#439938}


CrOS-Libchrome-Original-Commit: 3f2fd66ee3c869dbf43bf3c44877406ecfd871f3
2 files changed
tree: 0db2dd508726976d2eff3801cce28b238877c2ed
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/