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This CL applies pending_receiver to CreateNetLogExporter in
NetworkContext interface. StrongBindingSet is converted to
UniqueReceiverSet in this CL.

Bug: 955171
Change-Id: I72331247e92e6499b531a95c7f3dbd22ac97cc07
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1817998
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#699596}