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This is an optional CL.  There was a question from Micael about using named keys
for the menu options rather than an array index.  This CL shows what that would
look like.

Performance side-effect: inconsequential (measured by hand).

BUG=531786

Review URL: https://codereview.chromium.org/1420533011

Cr-Commit-Position: refs/heads/master@{#361390}