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Previously, ReportUploader is designed for reporting
ChromeDesktopReportRequest on Windows, Mac and Linux. To supporting
Chrome OS, now we change this class a little bit to reuse its logic.

Bug: 1010213
Change-Id: I724d203534ec1a831700842181aec4f1121b6d13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1908542Reviewed-by: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Commit-Queue: Anqing Zhao <anqing@google.com>
Cr-Commit-Position: refs/heads/master@{#715039}