Extract ScopedTestNSSDB from nss_util.
Before ScopedTestNSSDB affected several slot getters from nss_util.h . This change reduces ScopedTestNSSDB to solely setup a temporary test DB and not influencing the global state in nss_util anymore. As a replacement for some of its old behavior, a new ScopedTestSystemNSSKeySlot is added, which allows to override the slot returned by GetSystemNSSKeySlot(). With this change it's now possible to write tests that need both a user and system NSS DB by using ScopedTestSystemNSSKeySlot. As a side-effect, GetPersistentNSSKeySlot() is now compiled on !OS_CHROMEOS only. BUG=210525 (For include changes:) Remail@example.com TBRfirstname.lastname@example.org, email@example.com Review URL: https://codereview.chromium.org/401623006 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285881 0039d316-1c4b-4281-b951-d872f2087c98
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