Enable crashing of the browser if CACHE thread is not responsive but all other browser threads are responsive.
Enable crashing of the browser if CACHE thread is not
responsive but all other browser threads are responsive.

BUG=101841
R=jar
TEST=thread watcher unit tests

Review URL: http://codereview.chromium.org/8403019

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@108625 0039d316-1c4b-4281-b951-d872f2087c98

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