Auto convert content shell tests to JUnit4

content/shell/android/javatests/src/org/chromium/content_shell_apk/ContentShellShellManagementTest.java

-// Copyright 2017 The Chromium Authors. All rights reserved.
+// Copyright 2015 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.content_shell_apk;
 
 import android.support.test.filters.SmallTest;
 
 import org.junit.Assert;
 import org.junit.Rule;
 import org.junit.Test;
@@ skipping 36 matching lines @@
         mActivityTestRule.loadNewShell(TEST_PAGE_2);
         Assert.assertEquals(TEST_PAGE_2,
                 activity.getActiveShell().getContentViewCore().getWebContents().getUrl());
 
         Assert.assertNotSame(previousActiveShell, activity.getActiveShell());
         Assert.assertTrue(previousActiveShell.isDestroyed());
         Assert.assertFalse(previousActiveShell.getContentViewCore().isAlive());
     }
 
 }