MSan: increase the test timeout multiplier to 6x.

BUG=178409
[email protected]
NOTRY=true

Review URL: https://codereview.chromium.org/424693005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285891 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed