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This is needed to make command-line changes take effect.

Also, added checks to prevent a similar mistake from happening in the future. Actually, the checks detected such misuse in process_util_unittests, and this CL fixes it.

BUG=85287
Review URL: http://codereview.chromium.org/7044048

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@88561 0039d316-1c4b-4281-b951-d872f2087c98