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We removed this typemap when moving the mojom into WebKit, now we add it
back to do the marshaling between ClipboardBuffer and ClipboardType on
the browser side.

As we don't intend at this time to send messages of this type in the
opposite direction we only implement the FromMojom method in
clipboard_struct_traits.

Bug: 775830
Change-Id: Ib3dacbcc5b3c029167e902afbf7c8c5c809f1ee9
Reviewed-on: https://chromium-review.googlesource.com/823542Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524593}