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This makes it easier to update the parameters used when changing how apps are launched without updating many call sites with unused parameters.

BUG=None
TEST=Covered by automated tests.

Review URL: https://chromiumcodereview.appspot.com/10700130

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@146554 0039d316-1c4b-4281-b951-d872f2087c98