Always update the permissions being delegated as Shell.

Previously the logic was to reuse the same permission delegate,
however since we are moving to the new API, that reuse is no longer
possible. So just always set up the permission delegate again to avoid
delegated permissions not being updated in PermissionManagerService.

Bug: 158736025
Fixes: 175085645
Test: MultiUserRollbackTest
Change-Id: I58acefe7bd9053a032b3df24c0c793f4e2aacde1

services/core/java/com/android/server/am/ActivityManagerService.java

@@ -17209,8 +17209,6 @@ public class ActivityManagerService extends IActivityManager.Stub
                     throw new SecurityException("Shell can delegate permissions only "
                             + "to one instrumentation at a time");
                 }
-                delegate.setPermissions(permissions);
-                return;
             }
 
             final int instrCount = mActiveInstrumentation.size();
@@ -17253,7 +17251,8 @@ public class ActivityManagerService extends IActivityManager.Stub
 
     private class ShellDelegate implements CheckOpsDelegate {
         private final int mTargetUid;
-        private @Nullable String[] mPermissions;
+        @Nullable
+        private final String[] mPermissions;
 
         ShellDelegate(int targetUid, @Nullable String[] permissions) {
             mTargetUid = targetUid;
@@ -17264,11 +17263,6 @@ public class ActivityManagerService extends IActivityManager.Stub
             return mTargetUid;
         }
 
-        void setPermissions(@Nullable String[] permissions) {
-            mPermissions = permissions;
-            PackageManager.invalidatePackageInfoCache();
-        }
-
         @Override
         public int checkOperation(int code, int uid, String packageName, boolean raw,
                 QuadFunction<Integer, Integer, String, Boolean, Integer> superImpl) {