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No change to NS path, this only removes the legacy path.

This removes some cookie code used in the legacy code path. This is
mostly deleting files, but also modifies a couple classes to remove
legacy-path-only code and reduce some complexity.

Bug: 990437
Test: run_webview_instrumentation_test_apk -f CookieManagerTest.*
Change-Id: I0418c6f76af19052d5ff597ba54f8ec773ea914d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1733847Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Auto-Submit: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684041}