Bad lock object.

Locking on an interned string can cause unexpected locking collisions, and we should lock the mLock object here.

Change-Id: I8b6557371b0cb79e1bcbc732982cf66b9de663a5

services/core/java/com/android/server/clipboard/ClipboardService.java

@@ -582,7 +582,7 @@ public class ClipboardService extends SystemService {
 
     void setPrimaryClipInternal(PerUserClipboard clipboard, @Nullable ClipData clip,
             int uid) {
-        synchronized ("mLock") {
+        synchronized (mLock) {
             setPrimaryClipInternalLocked(clipboard, clip, uid, null);
         }
     }