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This CL ensures that when the PrintingEnabled policy or the corresponding
printing.enabled pref is set, the JS window.print() call is completely
ignored. Previously, it was bringing up a print preview dialog.

BUG=107709
TEST=Policy and pref both successfully block JS printing


Review URL: https://chromiumcodereview.appspot.com/10689190

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148622 0039d316-1c4b-4281-b951-d872f2087c98