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In bot mode, test_launcher would normally retry tests up to 3 times.
This is sufficient to keep large test suites like browser_tests under
1% flakiness rate if the flakiness of individual tests is also within
1%. However, some tests especially in browser_tests are up to 33%
flaky, making the browser_tests suite 40% flaky.

Subsequent top-level retries effectively double the runtime of all
bots running these tests, and we need a solution to shorten the try
job runtime.

A longer-term solution is the ignorer bot (see the bug), but until
it's deployed, a quick hack is to increase the number of retries so
statistically we should see about 1% flakiness of browser_tests at the
expense of a slight runtime increase.

R=sergiyb@chromium.org
BUG=390600, 395189

Review URL: https://codereview.chromium.org/393283006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284650 0039d316-1c4b-4281-b951-d872f2087c98