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Plugin belongs to browser instance. We don't need browser context to get
plugin lists. Hence move plugin from ChromeUserProfileInfo to
BrwoserReport.

1) Remove Plugin related code from ProfileReportGenerator
2) Because of 1), ProfileReportGenerator does not need to be async.
3) ReportGenerator remains async as Plugin information will be get here.

Getting plugin info in ReportGenerator will be added in the following CL.

Bug: 956237
Change-Id: I04c5ac519bc5c03e5436e10e98eebcf9a27b11fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764278
Commit-Queue: Owen Min <zmin@chromium.org>
Reviewed-by: Marc-André Decoste <mad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690884}