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
diff --git a/src/com/android/settings/Settings.java b/src/com/android/settings/Settings.java
index e92027a..a2b499d 100644
--- a/src/com/android/settings/Settings.java
+++ b/src/com/android/settings/Settings.java
@@ -40,7 +40,6 @@
     public static class PublicVolumeSettingsActivity extends SettingsActivity { /* empty */ }
     public static class WifiSettingsActivity extends SettingsActivity { /* empty */ }
     public static class WifiP2pSettingsActivity extends SettingsActivity { /* empty */ }
-    public static class InputMethodAndLanguageSettingsActivity extends SettingsActivity { /* empty */ }
     public static class AvailableVirtualKeyboardActivity extends SettingsActivity { /* empty */ }
     public static class KeyboardLayoutPickerActivity extends SettingsActivity { /* empty */ }
     public static class PhysicalKeyboardActivity extends SettingsActivity { /* empty */ }
@@ -68,10 +67,7 @@
     }
     public static class BackgroundCheckSummaryActivity extends SettingsActivity { /* empty */ }
     public static class StorageUseActivity extends SettingsActivity { /* empty */ }
-    public static class DevelopmentSettingsActivity extends SettingsActivity {
-        public static final String DASHBOARD_ALIAS =
-                "com.android.settings.DevelopmentSettingsDashboardAlias";
-    }
+    public static class DevelopmentSettingsActivity extends SettingsActivity { /* empty */ }
     public static class AccessibilitySettingsActivity extends SettingsActivity { /* empty */ }
     public static class CaptioningSettingsActivity extends SettingsActivity { /* empty */ }
     public static class AccessibilityInversionSettingsActivity extends SettingsActivity { /* empty */ }
@@ -87,7 +83,6 @@
     public static class BatterySaverSettingsActivity extends SettingsActivity { /* empty */ }
     public static class AccountSyncSettingsActivity extends SettingsActivity { /* empty */ }
     public static class AccountSyncSettingsInAddAccountActivity extends SettingsActivity { /* empty */ }
-    public static class GestureSettingsActivity extends SettingsActivity { /* empty */ }
     public static class CryptKeeperSettingsActivity extends SettingsActivity { /* empty */ }
     public static class DeviceAdminSettingsActivity extends SettingsActivity { /* empty */ }
     public static class DataUsageSummaryActivity extends SettingsActivity { /* empty */ }