Fix RetriableHttp

R=sergeyberezin@google.com
BUG=

Review-Url: https://codereview.chromium.org/2127373005
Cr-Mirrored-From: https://chromium.googlesource.com/infra/infra
Cr-Mirrored-Commit: 36b9234bed528104780967e31dd496a098426594
4 files changed