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This CL moves the content::URLLoaderThrottle used to interrupt the
request/response into blink. After this CL, we have to override
blink::URLLoaderThrottle to implement different throttles.

See more at
https://docs.google.com/document/d/18TVbhZ4MnGTCHYqeQtqz59SdTHP7CFqVyHWYbcD_d5A/edit?usp=sharing


BUG=860403

Change-Id: I7c287de0495e171b37586165003ef4e204c321de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1701135
Commit-Queue: Minggang Wang <minggang.wang@intel.com>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681704}