MediaPlayer2: uid is always valid.

Test: MediaPlayer2 plays
Bug: 63934228
Change-Id: I4c9fefe1cdb04f0f7fa82cf08f382c12f6bf5b0b
diff --git a/media/libmediaplayer2/nuplayer2/NuPlayer2.h b/media/libmediaplayer2/nuplayer2/NuPlayer2.h
index 594525c..cdb9a4f 100644
--- a/media/libmediaplayer2/nuplayer2/NuPlayer2.h
+++ b/media/libmediaplayer2/nuplayer2/NuPlayer2.h
@@ -39,9 +39,7 @@
 struct NuPlayer2Driver;
 
 struct NuPlayer2 : public AHandler {
-    explicit NuPlayer2(pid_t pid, const sp<MediaClock> &mediaClock);
-
-    void setUID(uid_t uid);
+    explicit NuPlayer2(pid_t pid, uid_t uid, const sp<MediaClock> &mediaClock);
 
     void setDriver(const wp<NuPlayer2Driver> &driver);
 
@@ -152,9 +150,8 @@
     };
 
     wp<NuPlayer2Driver> mDriver;
-    bool mUIDValid;
-    uid_t mUID;
     pid_t mPID;
+    uid_t mUID;
     const sp<MediaClock> mMediaClock;
     Mutex mSourceLock;  // guard |mSource|.
     sp<Source> mSource;