Revert of Removes usage of native base::android::GetApplicationContext()

webrtc/test/android/org/webrtc/native_test/RTCNativeUnitTestActivity.java

-/*
- *  Copyright 2017 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.webrtc.native_test;
-
-import android.app.Activity;
-import android.os.Bundle;
-
-/**
- * Activity that uses RTCNativeUnitTest to run the tests.
- */
-public class RTCNativeUnitTestActivity extends Activity {
-  private RTCNativeUnitTest mTest = new RTCNativeUnitTest();
-
-  @Override
-  public void onCreate(Bundle savedInstanceState) {
-    mTest.preCreate(this);
-    super.onCreate(savedInstanceState);
-    mTest.postCreate(this);
-  }
-
-  @Override
-  public void onStart() {
-    super.onStart();
-    mTest.postStart(this, false);
-  }
-}