Revert the part of http://codereview.chromium.org/593018 touching unload_uitest.cc
Revert the part of http://codereview.chromium.org/593018 touching unload_uitest.cc

The test started to hang mysteriously on Linux Tests(dbg)(1) and I remember some
past problems about this test. Would need more investigation. The test is
fine on all other platforms and bots, including Linux Tests(dbg)(2).

TBR=brettw
TEST=stop hanging
BUG=none

Review URL: http://codereview.chromium.org/597020

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@38611 0039d316-1c4b-4281-b951-d872f2087c98

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