Browser: add valid missing fragments (fixes FC)

WebsiteSettingsFragment and DebugPreferencesFragment are also valid
fragments.

Change-Id: I4e945a3b9de62879afcc621fb97811e75ca53cb1
(cherry picked from commit 5f880c6b6b335c8529e415a37ebdd9c2fc8f484a)
Browser: fix pie crash

Introduced in 5623a091605bf1d88687dc589a61ee6b54c554fe.

Change-Id: I83f44be84fb70e2777ab1414c0af2a368c435fb8
(cherry picked from commit 06929f1b1103f5a5651a8fc71e6b6e6b10bde71d)