Use system constants instead of NULL for unset PID.
Review URL: http://codereview.chromium.org/6759048

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@80225 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: 38788d94bc411c89d6a0bbebe6e0628e401e43e4
1 file changed
tree: 2da514bbae1c8f2fe59e448b1b44ecd97f3402a7
  1. base/
  2. build/
  3. ipc/
  4. testing/
  5. third_party/