Update Android instrumentation tests to use JUnit4.

webrtc/sdk/android/BUILD.gn

 # Copyright (c) 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.
 
 import("//webrtc/build/webrtc.gni")
 import("//build/config/android/config.gni")
@@ skipping 189 matching lines @@
       "instrumentationtests/src/org/webrtc/NetworkMonitorTest.java",
       "instrumentationtests/src/org/webrtc/PeerConnectionTest.java",
       "instrumentationtests/src/org/webrtc/RendererCommonTest.java",
       "instrumentationtests/src/org/webrtc/SurfaceTextureHelperTest.java",
       "instrumentationtests/src/org/webrtc/SurfaceViewRendererOnMeasureTest.java",
       "instrumentationtests/src/org/webrtc/WebRtcJniBootTest.java",
     ]
 
     deps = [
       "//base:base_java",
+      "//base:base_java_test_support",
+      "//third_party/android_support_test_runner:rules_java",
+      "//third_party/android_support_test_runner:runner_java",
+      "//third_party/junit",
       "//webrtc/base:base_java",
       "//webrtc/sdk/android:libjingle_peerconnection_java",
       "//webrtc/sdk/android:libjingle_peerconnection_metrics_default_java",
     ]
 
     shared_libraries = [ "//webrtc/sdk/android:libjingle_peerconnection_so" ]
   }
 }