Mac: fix MainMenu.xib.
Mac: fix MainMenu.xib.

Rolled back MainMenu.xib to before r40905
<http://codereview.chromium.org/660438> and re-did the changes.

BUG=none
TEST=Open MainMenu.xib in Interface Builder; should be able to open Chrome main; should be able to save and re-open MainMenu.xib successfully. Show Full History menu should appear as after r40905 (at bottom of History menu, with favicon) and work properly.

Review URL: http://codereview.chromium.org/990001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@41601 0039d316-1c4b-4281-b951-d872f2087c98

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