Temporarily disable the fast stack unwinder on the chromium.fyi LSan bot.
Temporarily disable the fast stack unwinder on the chromium.fyi LSan bot.

This should help us debug leaks in browser_tests, many of which are reported
with incomplete stack traces.

BUG=258031
R=timurrrr@chromium.org

Review URL: https://codereview.chromium.org/27695004

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@229125 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build