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With this CL,
1. Record the BackgroundFetch.HasRequestsWithBody UMA metric, which is
true if any requests in the background fetch contain a body, false otherwise.
2. Reject the fetch() promise, if any requests do contain a body.

Bug: 881344
Change-Id: I595800adefe1dcc2c8bb04bec2295cc2886d963d
Reviewed-on: https://chromium-review.googlesource.com/1210125
Commit-Queue: Mugdha Lakhani <nator@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590309}