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This is step 3 to removing _lastRegisteredRequestURL from
CRWWebController. This CL has no functional change.

Bug: 789993,792515
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ia415197025b4b3461fc807602e17063a753c39c1
Reviewed-on: https://chromium-review.googlesource.com/812446
Commit-Queue: Danyao Wang <danyao@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522460}