Makes open all work again on the bookmark bar's context menu.
Makes open all work again on the bookmark bar's context menu.

BUG=4540
TEST=Right click on the bookmark bar (not over a button) and make sure
  open all opens all the bookmarks on the bookmark bar.

Review URL: http://codereview.chromium.org/13790

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@6904 0039d316-1c4b-4281-b951-d872f2087c98

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