commit bed9bc8ab47755b9be2032dc398af2060bc94ede
author Chris Hamilton <chrisha@chromium.org> Wed Jul 11 23:13:35 2018
committer Commit Bot <commit-bot@chromium.org> Wed Jul 11 23:13:35 2018
tree c8905e4d1a86e57036506e7ff060696749b84aa5
parent ff991fb5cf3ff872e2096ac735376369aaed5d87

Make URLDataSource backend reference a WeakPtr.

This allows URLDataSources that have been detached from a backend to
still refer to the backend if it still exists, allowing any pending
queries that were issued to that backend and routed to the data source
to resolve back to the backend when they are finished.

BUG=859193

Change-Id: I55eda45be1f24716ad31c7d98ee748a737baca51
Reviewed-on: https://chromium-review.googlesource.com/1131537
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574398}