Zen: Move zen mode preference to switch bar.

- Add summary line support to SwitchBar.
 - Remove obsolete strings.
 - Wire up switchbar to zen mode w/ dialog prompt.
 - Remove obsolete callback pref helper.

Bug: 20064962
Change-Id: Ifede00b5d43d441ccd94db96bd2796bc57d1a990

src/com/android/settings/notification/ZenModeConditionSelection.java

@@ -27,7 +27,6 @@ import android.os.UserHandle;
 import android.service.notification.Condition;
 import android.service.notification.IConditionListener;
 import android.service.notification.ZenModeConfig;
-import android.text.TextUtils;
 import android.util.Log;
 import android.widget.CompoundButton;
 import android.widget.RadioButton;
@@ -117,7 +116,7 @@ public class ZenModeConditionSelection extends RadioGroup {
             }
         }
         if (v != null) {
-            v.setText(!TextUtils.isEmpty(c.line1) ? c.line1 : c.summary);
+            v.setText(ZenModeSettings.computeConditionText(c));
             v.setEnabled(c.state == Condition.STATE_TRUE);
         }
         mConditions.add(c);