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Remove unused arguments, to make blink and mojo more "thin" and readable.

https://cs.chromium.org/chromium/src/third_party/blink/public/mojom/clipboard/clipboard.mojom?l=62

Bug: 956291
Change-Id: I62a14b7fd3cb35f566a31d3fd5ac43995724534f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1582305Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654710}