MachMessageServer: eliminate argument redundancy

MachMessageServer: eliminate argument redundancy.

MachMessageServer::Run()’s distinct |nonblocking| parameter is removed.
The information it formerly conveyed is now implied by the |timeout_ms|
parameter, which can accept two special values,
kMachMessageTimeoutNonblocking and kMachMessageTimeoutWaitIndefinitely.

TEST=client_test, snapshot_test, util_test
R=rsesek@chromium.org

Committed: https://chromium.googlesource.com/crashpad/crashpad/+/c874958fd0d5044631d126cd7274f9258fef275b

[Mark Mentovai, 2014-12-04 21:10:00]

mark@chromium.org changed reviewers:
+ rsesek@chromium.org

[Mark Mentovai, 2014-12-04 21:10:00]

This is a net code negative, which is a net positive!

[Robert Sesek, 2014-12-05 20:14:52]

LGTM

[Mark Mentovai, 2014-12-10 16:11:35]

Committed patchset #3 (id:40001) manually as
c874958fd0d5044631d126cd7274f9258fef275b (presubmit successful).