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This configures cookie settings in the NetworkContext, based on
non-service code path (defined in WebView's CookieManager). This
refactors the cookie-path logic to a shared location in
AwBrowserContext.

Specifically, this configures the following:

 * save and restore session cookies
 * cookies should persist to disk

This also does some minor refactoring for the HTTP cache, for
consistency.

Bug: 933456, 933457, 902641
Test: None
Cq-Include-Trybots: master.tryserver.chromium.android:android_mojo
Change-Id: Ib53d4cbab8ccdf2f916a256f6d549bea644b6611
Reviewed-on: https://chromium-review.googlesource.com/c/1385492
Auto-Submit: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635625}