Also reduces the number of iterations for the shutdown tests in debug.
Also reduces the number of iterations for the shutdown tests in debug.

The same change was made to the startup tests because they are too slow
in debug.

Review URL: http://codereview.chromium.org/9252020

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@118173 0039d316-1c4b-4281-b951-d872f2087c98

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