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Rename QuotaDiskInfoHelper to QuotaDeviceInfoHelper and add another
method to it, AmountOfPhysicalMemory. This allows mocking physical
memory in unit tests, particularly useful for testing code having to
do with incognito mode. This change also removes a specialized
function in QuotaSettings that was used exclusively for testing.

Follow up to https://crrev.com/c/1890055

Bug: 1017120
Change-Id: If28105bba658cdff1e3f58340b6dc7bda8285289
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895074Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Commit-Queue: Jarryd Goodman <jarrydg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713309}