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This CL adds a browser test for desktop geolocation where persistence is
toggled off, ensuring that the underlying content setting isn't changed.
Additional checks of the content setting are added to the existing grant
and block tests.

This CL also simplifies the feature list setting used in the
PermissionContextBase test.

BUG=632269

Review-Url: https://codereview.chromium.org/2338173002
Cr-Commit-Position: refs/heads/master@{#418841}