Set limits on the number of requests from fetch() with keepalive set

This change adds an extra limit on the number of requests initiated by
fetch() with keepalive set.

Bug: 764589
Change-Id: Id030f46fadceebb07b606824c420dab5f1791472
Reviewed-on: https://chromium-review.googlesource.com/895218
Commit-Queue: Yutaka Hirano <[email protected]>
Reviewed-by: Takeshi Yoshino <[email protected]>
Cr-Commit-Position: refs/heads/master@{#536989}
2 files changed