PRESUBMIT.py: use new way to specify default try builders

In https://codereview.chromium.org/178223016 and
https://codereview.chromium.org/197963003 the way the
PRESUBMIT.py specifies the default try builders for a
try job have changed.

When submitting a try job now, the test filter argument no
longer works unless --bot is also specified.
This CL attempts to resolve this by moving away from the
deprecated approach onto using the new format instead.

This CL also includes two new trybots: win_asan and linux_tsan2
(added in https://codereview.chromium.org/220453004).

BUG=3148
TEST=Successfully fired off a -t compile job where the
test filter worked.

R=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/11119004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5839 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed