Remove old code relating to SystemSettings not used in new IA.

- remove activity alias: DevelopmentSettingsDashboardAlias,
DateTimeDashboardAlias, AboutDeviceDashboardAlias,
BackupResetDashboardAlias, EnterprisePrivacyDashboardAlias, and
AccessibilityDashboardAlias and updated the corresponding target
activities with the alias metadata.

- remove InputMethodAndLanguageSettingsActivity and
GestureSettingsActivity and the associated xml.

Bug: 35764802
Test: make RunSettingsRoboTests
Change-Id: I7d4922f8dfaac40e8ad077a68008185cd9fe3304

src/com/android/settings/SettingsActivity.java

@@ -951,9 +951,6 @@ public class SettingsActivity extends SettingsDrawerActivity
         setTileEnabled(new ComponentName(packageName,
                         Settings.DevelopmentSettingsActivity.class.getName()),
                 showDev, isAdmin);
-        setTileEnabled(new ComponentName(packageName,
-                        Settings.DevelopmentSettingsActivity.DASHBOARD_ALIAS),
-                showDev, isAdmin);
 
         if (UserHandle.MU_ENABLED && !isAdmin) {
             // When on restricted users, disable all extra categories (but only the settings ones).
@@ -981,17 +978,11 @@ public class SettingsActivity extends SettingsDrawerActivity
         setTileEnabled(new ComponentName(packageName,
                 BackupSettingsActivity.class.getName()), true,
                 isAdmin || Utils.isCarrierDemoUser(this));
-        setTileEnabled(new ComponentName(packageName,
-                "com.android.settings.BackupResetDashboardAlias"), true, isAdmin);
 
         setTileEnabled(new ComponentName(packageName,
                 Settings.EnterprisePrivacySettingsActivity.class.getName()),
                 FeatureFactory.getFactory(this).getEnterprisePrivacyFeatureProvider(this)
                         .hasDeviceOwner(), isAdmin);
-        setTileEnabled(new ComponentName(packageName,
-                        "com.android.settings.EnterprisePrivacyDashboardAlias"),
-                FeatureFactory.getFactory(this).getEnterprisePrivacyFeatureProvider(this)
-                        .hasDeviceOwner(), isAdmin);
         // Final step, refresh categories.
         updateCategories();
     }