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The fuchsia_dart SDK dependency is no longer required, so remove it.

Change-Id: I54a3151adf051c0f47087259e0d169366fcbdcba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2157225
Auto-Submit: Wez <wez@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760596}