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To avoid duplicating the tab drag MIME types, there are two options:
move the strings to a common dependency between Ash and Chrome, or move
the check to the Chrome side through a delegate.

This CL does the latter as it is more straightforward.

Bug: 1069869
Change-Id: I3d0c77cd2d7c6130d075074698cb8717d30362e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2198650
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768577}