Fix org.mockito.Matchers deprecation warnings in DirectRTCClientTest.

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

 /*
  *  Copyright 2016 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 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;
 import static org.mockito.Mockito.verifyNoMoreInteractions;
 
 import org.chromium.testing.local.LocalRobolectricTestRunner;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.robolectric.annotation.Config;
@@ skipping 75 matching lines @@
         "hello:world"
     };
     // clang-format on
 
     for (String invalidIp : invalidIpAddresses) {
       assertFalse(invalidIp + " matched IP_PATTERN even though it shouldn't.",
           DirectRTCClient.IP_PATTERN.matcher(invalidIp).matches());
     }
   }
 
+  // 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));
     try {
       Thread.sleep(SERVER_WAIT);
     } catch (InterruptedException e) {
       fail(e.getMessage());
     }
     client.connectToRoom(
         new AppRTCClient.RoomConnectionParameters(ROOM_URL, "127.0.0.1", LOOPBACK));
@@ skipping 21 matching lines @@
         .onRemoteIceCandidate(isNotNull(IceCandidate.class));
 
     client.disconnectFromRoom();
     verify(clientEvents, timeout(NETWORK_TIMEOUT)).onChannelClose();
     verify(serverEvents, timeout(NETWORK_TIMEOUT)).onChannelClose();
 
     verifyNoMoreInteractions(clientEvents);
     verifyNoMoreInteractions(serverEvents);
   }
 }