Migrate WaitableEvent to enum-based constructor in ipc/

Change automated with clang-tidy (details @ https://crbug.com/612843#c13)

BUG=612843

Review-Url: https://codereview.chromium.org/2027303002
Cr-Commit-Position: refs/heads/master@{#397230}


CrOS-Libchrome-Original-Commit: 90c2c5c5e952b2e67eb329bb849d4288cede4a42
6 files changed
tree: ad5196e5bd6c16537c466abff4ecde20e1aa6052
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/