Disable testharness.js timeout.
Reason: Our test runner has a separate timeout mechanism; currently whether the test result is Failure or Timeout depends on which happens first: hitting the testharness.js timeout or the run-webkit-tests timeout.
Disabling the testharness.js timeout by default by setting explicit_timeout was suggested by tkent@.
In some cases, this means that some tests that were hitting the testharness.js timeout in Debug builds will now be continuing to run longer, and either timing out or failing in a different way.
BUG=
664268
Committed:
https://crrev.com/1a8851a5030c4e6dbb51c98db5c3600d742985be
Cr-Commit-Position: refs/heads/master@{#432271}