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Rather than have each platform convert Unicode combining characters
before adding them to the DomKeyboardLayout, with this change each
platform adds the Unicode combining characters and they are converted
into printable characters as the LayoutMap is being created for
the user.

Bug: 832811
Change-Id: Ie1b23b228c1227b7c4be6e5409dba881ef1ff586
Reviewed-on: https://chromium-review.googlesource.com/1070756Reviewed-by: Joe Downing <joedow@chromium.org>
Commit-Queue: Gary Kacmarcik <garykac@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561321}