WebRTC: Make FYI ASan bots not auto-reboot.
WebRTC: Make FYI ASan bots not auto-reboot.

The split to builder+tester using the same machine
in https://codereview.chromium.org/965443002/ doesn't play
well with auto reboot. The tester starts before the reboot
is triggered, causing it to fail.
Disable auto reboot for now since this setup is only to verify
Git switch build properties functionality.

BUG=438170

Review URL: https://codereview.chromium.org/962133002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@294261 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build