Convert the rest of chrome_public_test_apk InstrumentationTestCases to JUnit4

chrome/android/javatests/src/org/chromium/chrome/browser/util/HashUtilTest.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.chrome.browser.util;
 
 import android.support.test.filters.SmallTest;
-import android.test.InstrumentationTestCase;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import org.chromium.base.test.util.Feature;
+import org.chromium.chrome.test.ChromeJUnit4ClassRunner;
 
-public class HashUtilTest extends InstrumentationTestCase {
-
+@RunWith(ChromeJUnit4ClassRunner.class)
+public class HashUtilTest {
+    @Test
     @SmallTest
     @Feature({"Sync", "Omaha"})
     public void testMd5HashGivesCorrectString() {
-        assertEquals("8e8cd7e8797678284984aa304e779ba5",
+        Assert.assertEquals("8e8cd7e8797678284984aa304e779ba5",
                 HashUtil.getMd5Hash(new HashUtil.Params("Chrome for Android")));
         // WARNING: The expected value for this must NEVER EVER change. Ever.
         // See http://crbug.com/179565.
-        assertEquals("6aa987da27016dade54b24ff5b846111",
+        Assert.assertEquals("6aa987da27016dade54b24ff5b846111",
                 HashUtil.getMd5Hash(new HashUtil.Params("Chrome for Android").withSalt("mySalt")));
     }
 }