Add "default:" to the WebLocalizedString switch statement in ToMessageID().
Add "default:" to the WebLocalizedString switch statement in ToMessageID().

This is needed to avoid compiler warnings about enum coverage when we
add new symbols to WebLocalizedString.h. This "default:" is going to
be removed when a planned WebLocalizedString.h change is merged

BUG=28264
TEST=none; no behavior change.
Review URL: http://codereview.chromium.org/4726002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@65502 0039d316-1c4b-4281-b951-d872f2087c98

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