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Since COPY_PASTE and DRAG_DROP handling of callbacks has been unified,
there is no need to differentiate between them.

Bug: 1144138
Change-Id: I6e55f12ddc0ce625c7cc164b40049bd33b8c65f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2514939
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Auto-Submit: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824176}