Opt-out for always-on VPN: rename API.

Rename the opt-out flag in AndroidManifest to
SERVICE_META_DATA_SUPPORTS_ALWAYS_ON
as directed by the API Council.

Bug: 64331776
Bug: 36650087
Test: runtest --path java/com/android/server/connectivity/VpnTest.java
Change-Id: I24326fad7a89083a2409134640bda81ee0359d08
diff --git a/core/java/android/net/ConnectivityManager.java b/core/java/android/net/ConnectivityManager.java
index 48123fe..744ee8e 100644
--- a/core/java/android/net/ConnectivityManager.java
+++ b/core/java/android/net/ConnectivityManager.java
@@ -840,8 +840,8 @@
      * In order to support the always-on feature, an app has to
      * <ul>
      *     <li>target {@link VERSION_CODES#N API 24} or above, and
-     *     <li>not opt out through the {@link VpnService#METADATA_SUPPORTS_ALWAYS_ON} meta-data
-     *         field.
+     *     <li>not opt out through the {@link VpnService#SERVICE_META_DATA_SUPPORTS_ALWAYS_ON}
+     *         meta-data field.
      * </ul>
      *
      * @param userId The identifier of the user for whom the VPN app is installed.
diff --git a/tests/net/java/com/android/server/connectivity/VpnTest.java b/tests/net/java/com/android/server/connectivity/VpnTest.java
index f0b3724..296cb76 100644
--- a/tests/net/java/com/android/server/connectivity/VpnTest.java
+++ b/tests/net/java/com/android/server/connectivity/VpnTest.java
@@ -346,7 +346,7 @@
         // Apps that opt out explicitly are not supported
         appInfo.targetSdkVersion = VERSION_CODES.CUR_DEVELOPMENT;
         Bundle metaData = new Bundle();
-        metaData.putBoolean(VpnService.METADATA_SUPPORTS_ALWAYS_ON, false);
+        metaData.putBoolean(VpnService.SERVICE_META_DATA_SUPPORTS_ALWAYS_ON, false);
         svcInfo.metaData = metaData;
         assertFalse(vpn.isAlwaysOnPackageSupported(PKGS[0]));
     }