Older Android style buttons were used for the bottom button bar. By changing them to use the buttonBarBottomStyle, they are updated to flat buttons. The bottom button bar for settings preference fragments now more closely tracks the Material Design spec as seen here in [0]. The other Settings views which use the button bar buttons are the Redaction settings and WiFi network picker in some contexts. These should be unaffected as they are based on the SettingsActivity, rather than the SettingsFragment, and inflate a different view. [0] https://material-design.storage.googleapis.com/publish/material_v_8/material_ext_publish/0B7WCemMG6e0VaDdZWXpLXzNicjg/components_buttons_usage6.png Bug: 28845586 Change-Id: I9ea55aa2fe1e76f8f952880675501cbb0f76719d