AW: disable quic for NetworkService

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}

android_webview/browser/aw_content_browser_client.cc

@@ -258,6 +258,10 @@ network::mojom::NetworkContextPtr AwContentBrowserClient::CreateNetworkContext(
 
   content::GetNetworkService()->CreateNetworkContext(
       MakeRequest(&network_context), std::move(context_params));
+
+  // Quic is not currently supported in WebView.
+  content::GetNetworkService()->DisableQuic();
+
   return network_context;
 }