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With this change, ProfileReportGenerator is passed a delegate factory
during construction, and takes its delegate directly from it instead of
receiving the delegate as constructor argument.

#Squeegee

Bug: 1091936
Change-Id: Iecc53e7b30a6f2bcb39f6c248ce40c94ae448fa9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2290056Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Guillaume Jenkins <gujen@google.com>
Cr-Commit-Position: refs/heads/master@{#787908}