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This connects the cache settings from AwSettings to the network service
code path, which fixes 2 related tests.

This creates the net_helpers file to share common logic between both the
network service and legacy code paths. Right now, this only contains
WebView's logic to translate WebView cache settings into net layer
load_flags.

Bug: 904890
Bug: 893573
Bug: 893574
Test: run_webview_instrumentation_test_apk \
Test: --enable-features=NetworkService,NetworkServiceInProcess \
Test: -f=ClientOnReceivedError*Test#test*CacheMiss
Cq-Include-Trybots: master.tryserver.chromium.android:android_mojo
Change-Id: Ic2d62dfedd5f0c1ddfa04469454aea7d43df9373
Reviewed-on: https://chromium-review.googlesource.com/c/1339720Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Tim Volodine <timvolodine@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609875}