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Also make IsolationInfo mandatory for requests using a profile's main
NetworkContext.  In the future this will be extended to other APIs that
take NIKs (WebSockets, DNS lookups, etc).

Bug: 1082280
Change-Id: I630f501cfaf57ea01af8af05c37c9bd79bda20ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2180542
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Shivani Sharma <shivanisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768749}