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

Review URL: https://codereview.chromium.org/413733003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@285006 0039d316-1c4b-4281-b951-d872f2087c98

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