Add a std::nullptr_t constructor to base::WeakPtr.

BUG=none

Review URL: https://codereview.chromium.org/1863643002

Cr-Commit-Position: refs/heads/master@{#385267}


CrOS-Libchrome-Original-Commit: efeb19b8a79d8f953f0e432a7491a67ea113b9d8
2 files changed
tree: 2b44bb8f3b12a5e6cfc184fb4c21152777e9ccec
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/