TrustManagerService: remove unused field

Remove the mVirtualDeviceManager field which is no longer used.  This
fixes an errorprone warning which showed up on an unrelated CL.

Ignore-AOSP-First: Fixes ag/25111900
Test: build
Bug: 300402201
Bug: 306620764
Change-Id: I189f6ff0def64a953ae75a0356661e41361d407b
diff --git a/services/core/java/com/android/server/trust/TrustManagerService.java b/services/core/java/com/android/server/trust/TrustManagerService.java
index e5a8a6d..dbf777f 100644
--- a/services/core/java/com/android/server/trust/TrustManagerService.java
+++ b/services/core/java/com/android/server/trust/TrustManagerService.java
@@ -83,7 +83,6 @@
 import com.android.internal.util.DumpUtils;
 import com.android.internal.widget.LockPatternUtils;
 import com.android.server.SystemService;
-import com.android.server.companion.virtual.VirtualDeviceManagerInternal;
 
 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
@@ -160,7 +159,6 @@
     private final ActivityManager mActivityManager;
     private FingerprintManager mFingerprintManager;
     private FaceManager mFaceManager;
-    private VirtualDeviceManagerInternal mVirtualDeviceManager;
 
     private enum TrustState {
         // UNTRUSTED means that TrustManagerService is currently *not* giving permission for the