Reenable inspector-protocol/input/dispatchKeyEvent-focus.html on mac.
Reenable inspector-protocol/input/dispatchKeyEvent-focus.html on mac.

BUG=474224
TBR=jsbell@chromium.org

Review URL: https://codereview.chromium.org/1076303002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@193567 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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