WebUI: Fix issue with context menu
WebUI: Fix issue with context menu

This was due to a typo.

BUG=72991
TEST=Go to bookmark manager
     Right click a bookmark in the bookmark manager
     Use up/down arrow keys to select menu items.

Review URL: http://codereview.chromium.org/6525025

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@75013 0039d316-1c4b-4281-b951-d872f2087c98

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