Remove the feature flag for using new title.

- remove all code that check for the feature flag, and use the new logic
by default.

Change-Id: I7fbe60da84c1c0f35e7241402a71d2bc4cd300e6
Fixes: 64564191
Test: make RunSettingsRoboTests

src/com/android/settings/applications/manageapplications/ManageApplications.java

@@ -293,7 +293,7 @@ public class ManageApplications extends InstrumentedPreferenceFragment
 
         mResetAppsHelper = new ResetAppsHelper(activity);
 
-        if (usePreferenceScreenTitle() && screenTitle > 0) {
+        if (screenTitle > 0) {
             activity.setTitle(screenTitle);
         }
     }