Update Android instrumentation tests to use JUnit4.

webrtc/sdk/android/instrumentationtests/src/org/webrtc/WebRtcJniBootTest.java

Index: webrtc/sdk/android/instrumentationtests/src/org/webrtc/WebRtcJniBootTest.java
diff --git a/webrtc/sdk/android/instrumentationtests/src/org/webrtc/WebRtcJniBootTest.java b/webrtc/sdk/android/instrumentationtests/src/org/webrtc/WebRtcJniBootTest.java
index 2f04f15ddf1c0853f305b8fb52bde6a9fc1f3250..c3b5b45798a4129dfdf020d94f41c11c2a505f8d 100644
--- a/webrtc/sdk/android/instrumentationtests/src/org/webrtc/WebRtcJniBootTest.java
+++ b/webrtc/sdk/android/instrumentationtests/src/org/webrtc/WebRtcJniBootTest.java
@@ -10,18 +10,22 @@
 
 package org.appspot.apprtc.test;
 
-import android.test.InstrumentationTestCase;
-import android.test.suitebuilder.annotation.SmallTest;
-
+import android.support.test.InstrumentationRegistry;
+import android.support.test.filters.SmallTest;
+import org.chromium.base.test.BaseJUnit4ClassRunner;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 import org.webrtc.PeerConnectionFactory;
 
 // This test is intended to run on ARM and catch LoadLibrary errors when we load the WebRTC
 // JNI. It can't really be setting up calls since ARM emulators are too slow, but instantiating
 // a peer connection isn't timing-sensitive, so we can at least do that.
-public class WebRtcJniBootTest extends InstrumentationTestCase {
+@RunWith(BaseJUnit4ClassRunner.class)
+public class WebRtcJniBootTest {
+  @Test
   @SmallTest
   public void testJniLoadsWithoutError() throws InterruptedException {
-    PeerConnectionFactory.initializeAndroidGlobals(getInstrumentation().getTargetContext(),
+    PeerConnectionFactory.initializeAndroidGlobals(InstrumentationRegistry.getTargetContext(),
         true /* initializeAudio */, true /* initializeVideo */,
         false /* videoCodecHwAcceleration */);