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This removes safe-browsing-real-time from about:flags since the
feature is enabled by default and has shipped to 100% of Stable.

This also removes safe-browsing-available from flag-metadata.json.
This flag was removed from about:flags in a previous CL, but the
flag-metadata.json entry was left behind.

Bug: 1028755
Change-Id: I62b90e18594f906d3bc7e87392fe2afcd35f8f72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2595609
Auto-Submit: Ali Juma <ajuma@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837715}