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Simplify and combine Dispatch{,Fabricated}KeyEventPostIME methods into one method.

TEST=Run unit_tests, ui_unittests, views_unittests.
TBR=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/142043006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247947 0039d316-1c4b-4281-b951-d872f2087c98