gtk: Use 'Preferences' instead of 'Options' in wrench menu.
gtk: Use 'Preferences' instead of 'Options' in wrench menu.

BUG=17870
TEST=launch chrome, open the wrench menu, see if the 'Preferences' menu is in
there instead of the 'Options' menu.

Review URL: http://codereview.chromium.org/3060050

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@56148 0039d316-1c4b-4281-b951-d872f2087c98

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