[Mac] Use |-performSelector:withDelay:| to execute commands from the Wrench menu.
[Mac] Use |-performSelector:withDelay:| to execute commands from the Wrench menu.

This avoids doing work from within the menu's nested run loop, which can lead to
wonky behavior.

BUG=49716
TEST=Enter full screen from Wrench menu a few times. The overlay always appears.

Review URL: http://codereview.chromium.org/3014021

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@53185 0039d316-1c4b-4281-b951-d872f2087c98

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