commit cb90dea3f3a837406a404a917f0714253b7ecb96
author Gauthier Ambard <gambard@chromium.org> Wed Jul 31 16:02:47 2019
committer Commit Bot <commit-bot@chromium.org> Wed Jul 31 16:02:47 2019
tree 938eea2f8cd3c9f31b2da238af3743ddcc2d8ca0
parent 2908b7c4b86cf016ab7a88460c131182eafe4ed3

[iOS][web] Don't commit null item

In some cases null items could be committed.
For example if two navigations are pending at the same time:
1. Both navigations start
2. Second navigation is hitting "LoadRequest", resetting the pending
   item.
3. First navigation commit, the "pending item" (which is null) is
   committed.

This CL prevents this.

Bug: 979569
Change-Id: I504a0a9d9186cf276a9210167d724de2c7c4bbad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1725642
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682740}