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This disables the QUIC protocol in WebView for the NetworkService path.
This protocol is not currently supported.

R=jam@chromium.org

Bug: 887538
Test: Manual - nothing seems drastically broken
Change-Id: I0f88c257b3fd2928492888ecb09793aa3e3c45b1
Cq-Include-Trybots: master.tryserver.chromium.android:android_mojo
Reviewed-on: https://chromium-review.googlesource.com/c/1322357Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606086}