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Make these tests and settings_quota_unittest run in extensions_unittests.

Move a test that depends on sync (not available in the extensions module) to settings_sync_unittest.

Depends on previous CL: https://chromiumcodereview.appspot.com/461273003/

BUG=397164

Review URL: https://codereview.chromium.org/472343003

Cr-Commit-Position: refs/heads/master@{#292412}