Bring back the retry limit to 3.

Bring back the retry limit to 3.

This reverts r284650. There is one test that is flaky 34% of the time, but that is the exception and not the norm. We don't need 12 retries to make browser_tests or other test suites not flaky. If there are very flaky tests, we should disable them instead. I've disabled all the tests that flake more than 5% of the time.

BUG=395189
R=brettw@chromium.org, sergeyberezin@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=285006

[brettw, 2014-07-23 16:28:55]

lgtm

[Sergey Berezin, 2014-07-23 18:02:09]

LGTM.

My stats don't show any noticeable difference in bot / step flakiness or
runtime, let's indeed revert.

[jam, 2014-07-23 18:40:27]

The CQ bit was checked by jam@chromium.org

[commit-bot: I haz the power, 2014-07-23 18:41:56]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jam@chromium.org/413733003/1