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In bug 882661: one mojo::URLLoader is sending OnStartLoadingResponseBody
without sending OnReceiveResponse before.

Add instrumentation to check this never happen with this class.

Bug: 882661
Change-Id: I8a157949feacfe65f0ea1aa8c32b28352d6d6f57
Reviewed-on: https://chromium-review.googlesource.com/c/1288595
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601087}