Update AppRTCMobile tests to use JUnit4.

webrtc/examples/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("../build/webrtc.gni")
 if (is_android) {
@@ skipping 98 matching lines @@
     java_files = [
       "androidtests/src/org/appspot/apprtc/test/FileVideoCapturerTest.java",
       "androidtests/src/org/appspot/apprtc/test/PeerConnectionClientTest.java",
       "androidtests/src/org/appspot/apprtc/test/VideoFileRendererTest.java",
     ]
 
     apk_under_test = ":AppRTCMobile"
 
     deps = [
       ":AppRTCMobile_javalib",
+      "//base:base_java_test_support",
+      "//third_party/android_support_test_runner:runner_java",
+      "//third_party/junit",
       "//webrtc/sdk/android:libjingle_peerconnection_java",
     ]
 
     data = [
       "//webrtc/examples/androidtests/src/org/appspot/apprtc/test/capturetestvideo.y4m",
     ]
   }
 }
 
 if (is_ios || (is_mac && target_cpu != "x86")) {
@@ skipping 460 matching lines @@
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
 
     deps = [
       "../p2p:libstunprober",
       "../p2p:rtc_p2p",
       "../system_wrappers:field_trial_default",
     ]
   }
 }