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Add code 413 Payload too large. This error is returned when the request
is too large, usually caused by report uploading requests.

Add this error so that we could publish metrics and setup retry logic based
on it.

Any exist error handling code treat the new error same as
DM_STATUS_HTTP_STATUS_ERROR so there is no behavior change.

Bug: 959398
Change-Id: Id4e1c1a82558bc56d870cc247f88e343ef38a9ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1632533Reviewed-by: Aga Wronska <agawronska@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665165}