noahric 580df537ce Fix header guard in thread_annotations.h.
It was using a non-WebRTC-named header guard, which could conflict with
other similarly named/intended headers.

BUG=None
NO_DEPENDENCY_CHECKS=true

Review-Url: https://codereview.webrtc.org/2548113002
Cr-Commit-Position: refs/heads/master@{#15554}
2016-12-12 21:36:56 +00:00
..
2016-12-09 14:54:08 +00:00
2016-12-09 14:54:08 +00:00
2016-11-16 19:11:38 +00:00