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Every NSP has its own URLLoaderFactory, so this CL adds a simple
counter to that class and when the max is reached, sends
ERR_FAILED to all further requests.

Bug: 1127120
Change-Id: I14b8509bdd2c3a0de371675bfe37520c26fc8064
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404157Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806246}