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Chromium does not use the frame flattening code on any platform, though it used
to use it for frameset flattening on Android, but that is no longer the case.

As there is no intention of ever using it, it should be removed. This change
basically removed the code related to the WebCore setting.

Committed on behalf of Kenneth Rohde Christiansen <kenneth.r.christiansen@intel.com>.

TBR=darin@chromium.org

BUG=231898

Review URL: https://codereview.chromium.org/14293008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194745 0039d316-1c4b-4281-b951-d872f2087c98