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The base::SupportsUserData::Data superclass seems to be left over from a
previous architecture. It adds cognitive overhead, as it implies that
AppCacheRequestHandler may be used in a base::SupportsUserData
container.

Change-Id: Ibe61b6cec71ebd513eb8ccd896845d4c04b47f6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2066104
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743199}