This is actually taken by jzw@ but I somehow cannot assign to him, so I put me as an owner for now.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0d1995f8a6a40a9ddc90d7d5aa86b9937d1ec426

commit 0d1995f8a6a40a9ddc90d7d5aa86b9937d1ec426
Author: jzw <jzw@google.com>
Date: Tue Mar 28 03:18:37 2017

Fill in some fields in web_view_url_request_context_getter to fix crash.
Fixing this will allow the shell app to translate websites w/o issues.

BUG= 698654 

Review-Url: https://codereview.chromium.org/2771413002
Cr-Commit-Position: refs/heads/master@{#459992}

[modify] https://crrev.com/0d1995f8a6a40a9ddc90d7d5aa86b9937d1ec426/ios/web_view/internal/web_view_url_request_context_getter.mm