Cleans up sharedUser regardless of creation logic

Prior to this change, we were not updating the shared user a package
setting belongs to if the package setting was not deep copied. In the
case that shared users didn't match, we were not deep copying and so
were not updating later. There is a more fundamental change to be made
here, but we're limiting risk by keeping this change as small as
possible.

Bug: 138919405
Test: atest AppSecurityTests
Test: manual; flash P then flash this build: observe consistent PackageSettings
Change-Id: Ib22f9e6a1fb3104bec4eb3e5b1de983e19d49dce
(cherry picked from commit cf9a4835c110b3b7c064e1dde97ffb38ef0424eb)
diff --git a/services/core/java/com/android/server/pm/PackageManagerService.java b/services/core/java/com/android/server/pm/PackageManagerService.java
index d60fa2e..7469e09 100644
--- a/services/core/java/com/android/server/pm/PackageManagerService.java
+++ b/services/core/java/com/android/server/pm/PackageManagerService.java
@@ -320,7 +320,6 @@
 import com.android.server.pm.permission.PermissionManagerServiceInternal.PermissionCallback;
 import com.android.server.pm.permission.PermissionsState;
 import com.android.server.policy.PermissionPolicyInternal;
-import com.android.server.policy.PermissionPolicyInternal.OnInitializedCallback;
 import com.android.server.security.VerityUtils;
 import com.android.server.storage.DeviceStorageMonitorInternal;
 import com.android.server.wm.ActivityTaskManagerInternal;
@@ -11033,14 +11032,15 @@
         final String realPkgName = request.realPkgName;
         final List<String> changedAbiCodePath = result.changedAbiCodePath;
         final PackageSetting pkgSetting;
+        if (request.pkgSetting != null && request.pkgSetting.sharedUser != null
+                && request.pkgSetting.sharedUser != result.pkgSetting.sharedUser) {
+            // shared user changed, remove from old shared user
+            request.pkgSetting.sharedUser.removePackage(request.pkgSetting);
+        }
         if (result.existingSettingCopied) {
             pkgSetting = request.pkgSetting;
             pkgSetting.updateFrom(result.pkgSetting);
             pkg.mExtras = pkgSetting;
-            if (pkgSetting.sharedUser != null
-                    && pkgSetting.sharedUser.removePackage(result.pkgSetting)) {
-                pkgSetting.sharedUser.addPackage(pkgSetting);
-            }
         } else {
             pkgSetting = result.pkgSetting;
             if (originalPkgSetting != null) {
@@ -11050,6 +11050,9 @@
                 mTransferedPackages.add(originalPkgSetting.name);
             }
         }
+        if (pkgSetting.sharedUser != null) {
+            pkgSetting.sharedUser.addPackage(pkgSetting);
+        }
         // TODO(toddke): Consider a method specifically for modifying the Package object
         // post scan; or, moving this stuff out of the Package object since it has nothing
         // to do with the package on disk.