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Also modified the pyauto tests in process_count.py to use the new
automation hook.  Verified that this works on my local ChromeOS device,
my local Linux machine, and the Win/Mac trybots.  Re-enabling the tests
on Win/Mac in the CONTINUOUS suite to see if they now pass continuously.

BUG=94650,95142,93822
TEST=None

Review URL: http://codereview.chromium.org/7976016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@102406 0039d316-1c4b-4281-b951-d872f2087c98