Bug 1512274 - [geckoview] Avoid star imports. r=geckoview-reviewers,snorp

Depends on D23689

Differential Revision: https://phabricator.services.mozilla.com/D23690

--HG--
extra : moz-landing-system : lando

mobile/android/geckoview/src/main/java/org/mozilla/gecko/media/GeckoMediaDrmBridgeV21.java

@@ -4,7 +4,6 @@
 
 package org.mozilla.gecko.media;
 
-import java.lang.*;
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
@@ -26,9 +25,7 @@ import android.os.Handler;
 import android.os.HandlerThread;
 import android.media.DeniedByServerException;
 import android.media.MediaCrypto;
-import android.media.MediaCryptoException;
 import android.media.MediaDrm;
-import android.media.MediaDrmException;
 import android.media.NotProvisionedException;
 import android.util.Log;