Fix org.mockito.Matchers deprecation warnings in DirectRTCClientTest.

webrtc/examples/androidjunit/src/org/appspot/apprtc/DirectRTCClientTest.java

Index: webrtc/examples/androidjunit/src/org/appspot/apprtc/DirectRTCClientTest.java
diff --git a/webrtc/examples/androidjunit/src/org/appspot/apprtc/DirectRTCClientTest.java b/webrtc/examples/androidjunit/src/org/appspot/apprtc/DirectRTCClientTest.java
index 6079fc6ef8f31f52a40da6bf0b18c5f379f07fc1..2da8164ec73e8008199f74be37c7df2138fbbdc1 100644
--- a/webrtc/examples/androidjunit/src/org/appspot/apprtc/DirectRTCClientTest.java
+++ b/webrtc/examples/androidjunit/src/org/appspot/apprtc/DirectRTCClientTest.java
@@ -13,8 +13,8 @@ package org.appspot.apprtc;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
-import static org.mockito.Matchers.any;
-import static org.mockito.Matchers.isNotNull;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.isNotNull;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.timeout;
 import static org.mockito.Mockito.verify;
@@ -110,6 +110,8 @@ public class DirectRTCClientTest {
     }
   }
 
+  // TODO(sakal): Replace isNotNull(class) with isNotNull() once Java 8 is used.
+  @SuppressWarnings("deprecation")
   @Test
   public void testDirectRTCClient() {
     server.connectToRoom(new AppRTCClient.RoomConnectionParameters(ROOM_URL, "0.0.0.0", LOOPBACK));