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This implements CookieManager#flush() for the network service code path.

Now that this is implemented, we can easily test this functionality
(and this renames HttpCacheTest -> OnDiskFileTest since the file is now
more general).

This removes a TODO to implement more CookieManager APIs, because this
is the final API for AwCookieManagerWrapper.

Bug: 902641, 933456, 933462
Test: run_webview_instrumentation_test_apk \
Test: --enable-features=NetworkService,NetworkServiceInProcess \
Test: -f=OnDiskFileTest#*
Cq-Include-Trybots: master.tryserver.chromium.android:android_mojo
Change-Id: Ic99990719e87f8b1ed9bdc51aa7f1920c1ee5b88
Reviewed-on: https://chromium-review.googlesource.com/c/1481195
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635699}