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in Beta channel and XP. We will crash the browser
if UI/IO threads don't respond within 24 secs
(instead of 12 secs) in Beta channel and Windows XP.

BUG=90095
R=jar
TEST=thread_watcher unit tests

Review URL: http://codereview.chromium.org/7744015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@98697 0039d316-1c4b-4281-b951-d872f2087c98