Replace deprecated Android java test annotations

net/android/javatests/src/org/chromium/net/X509UtilTest.java

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.net;
 
 import static org.chromium.net.test.util.CertTestUtil.CERTS_DIRECTORY;
 
+import android.support.test.filters.MediumTest;
 import android.test.InstrumentationTestCase;
-import android.test.suitebuilder.annotation.MediumTest;
 
 import org.chromium.net.test.util.CertTestUtil;
 
 import java.io.IOException;
 import java.io.RandomAccessFile;
 import java.security.GeneralSecurityException;
 import java.util.Arrays;
 
 /**
  * Tests for org.chromium.net.X509Util.
@@ skipping 41 matching lines @@
                 CertTestUtil.pemToDer(CERTS_DIRECTORY + OK_CERT))));
 
         try {
             X509Util.clearTestRootCertificates();
         } catch (Exception e) {
             fail("Could not clear test root certificates: " + e.toString());
         }
     }
 }