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This CL converts NetworkContextRequest to new Mojo types.

It also updates GetNetworkContext from resource_provider.mojom
and CreateNetworkContext and network_service.mojom and methods
and members which implement them.

Bug: 955171, 978694
Change-Id: I053a8957685e4eed9d44615a5e74b451dc75fe49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1782203Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#693773}