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On Windows, ToUnicodeEx returns ASCII control characters for certain
functional keys. E.g., escape returns 0x1B. This change translates such
control characters to the corresponding key function instead of
reporting the keys as (unprintable) chacter-generating keys in the
layout.

In addition, this change checks for known, possibly redundant keys and
removes them for a cleaner layout. E.g., if Backslash and IntlBackslash
happen to generate the exact same characters for the current layout,
only Backslash will be included in the layout sent to the client.

Bug: 1026029
Change-Id: Ia261e5ca3baa86b16bba7a4bc6926b5d81c33c85
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1975296
Commit-Queue: Erik Jensen <rkjnsn@chromium.org>
Reviewed-by: Gary Kacmarcik <garykac@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729874}