Convert the rest of chrome_public_test_apk InstrumentationTestCases to JUnit4

chrome/android/javatests/src/org/chromium/chrome/browser/gsa/GSAServiceClientTest.java

 // Copyright 2016 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.gsa;
 
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.ServiceConnection;
 import android.os.IBinder;
+import android.support.test.InstrumentationRegistry;
 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.Log;
+import org.chromium.chrome.test.ChromeJUnit4ClassRunner;
 
 import java.util.concurrent.Semaphore;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicReference;
 
 /** Tests for GSAServiceClient. */
-public class GSAServiceClientTest extends InstrumentationTestCase {
+@RunWith(ChromeJUnit4ClassRunner.class)
+public class GSAServiceClientTest {
     private static final String TAG = "GSAServiceClientTest";
 
+    @Test
     @SmallTest
     public void testGetPssForService() throws Exception {
-        Context context = getInstrumentation().getTargetContext();
+        Context context = InstrumentationRegistry.getInstrumentation().getTargetContext();
 
         if (!GSAState.getInstance(context).isGsaAvailable()) {
             Log.w(TAG, "GSA is not available");
             return;
         }
 
         final AtomicReference<ComponentName> componentNameRef = new AtomicReference<>();
         final Semaphore semaphore = new Semaphore(0);
         Intent intent =
                 new Intent(GSAServiceClient.GSA_SERVICE).setPackage(GSAState.SEARCH_INTENT_PACKAGE);
 
         ServiceConnection connection = new ServiceConnection() {
             @Override
             public void onServiceConnected(ComponentName name, IBinder service) {
                 componentNameRef.set(name);
                 semaphore.release();
             }
 
             @Override
             public void onServiceDisconnected(ComponentName name) {}
         };
         context.bindService(intent, connection, Context.BIND_AUTO_CREATE);
         try {
-            assertTrue("Timeout", semaphore.tryAcquire(10, TimeUnit.SECONDS));
+            Assert.assertTrue("Timeout", semaphore.tryAcquire(10, TimeUnit.SECONDS));
 
             int pss = GSAServiceClient.getPssForService(componentNameRef.get());
-            assertTrue(pss != GSAServiceClient.INVALID_PSS);
-            assertTrue(pss > 0);
+            Assert.assertTrue(pss != GSAServiceClient.INVALID_PSS);
+            Assert.assertTrue(pss > 0);
         } finally {
             context.unbindService(connection);
         }
     }
 
+    @Test
     @SmallTest
     public void testGetPssForServiceServiceNotFound() throws Exception {
         ComponentName componentName = new ComponentName("unknown.package.name", "UnknownClass");
         int pss = GSAServiceClient.getPssForService(componentName);
-        assertTrue(pss == GSAServiceClient.INVALID_PSS);
+        Assert.assertTrue(pss == GSAServiceClient.INVALID_PSS);
     }
 }