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This method was only used by the BrowsingDataCookieHelper unit tests,
which this change converts to using the network::mojom::CookieManager
interface.

Bug: 721395
Change-Id: Ia4f5a54221d0ce902a42e8f910230ad0d732b7ee
Reviewed-on: https://chromium-review.googlesource.com/1236289Reviewed-by: Joshua Bell <jsbell@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593231}