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The capture experiment was removed in:
https://chromium-review.googlesource.com/c/chromium/src/+/2299184

However, some histogram deletions were missed. This CL makes those
histograms obsolete.

Bug: 1147100
Change-Id: Ie6d5f5d917ac1d7f14302648bbbc279ac745f263
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2544046Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829270}