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The ModuleEventSink interface was bound on the UI thread, which caused
cross-process IPC to retrieve information about a loaded module in the
renderer process.

A new sequence with background priority is instead used so that it
doesn't impact startup.

Bug: 832286
Change-Id: I5ab50bc45386c9a1ddb2888f80293d78bd768a88
Reviewed-on: https://chromium-review.googlesource.com/1037935Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558010}