aura: Fix keyevents from the numpad.
aura: Fix keyevents from the numpad.

It turns out XLookupKeysym does not take into account the status of the
lock/shift etc. keys. So we need to use XLookupString instead (which does).

BUG=101831
TEST=manually

Review URL: http://codereview.chromium.org/8416005

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@107621 0039d316-1c4b-4281-b951-d872f2087c98

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