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It's not immediatley clear to me how this broke, since I converted all the
callsites of the old method. However I've verified on each platform that this
now reports command line switches properly.

BUG=77656,298225

Review URL: https://codereview.chromium.org/25733002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226519 0039d316-1c4b-4281-b951-d872f2087c98