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This fixes a bug for uploads not getting completed as they have mime type
as text/html. The fix is to not let offline page backend intercept the
downloads if they are spawn from background service.

Bug: 976614
Change-Id: I99ebf8f0d9766baa4867ae17df470c72e2fe6c90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1669878
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672792}