Remove JUnit3 test cases

Bug: 711517
Change-Id: I78f6c274a62066039f69fcf2ac66f232379b959c
Reviewed-on: https://chromium-review.googlesource.com/887737Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Yoland Yan <yolandyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532078}

base/BUILD.gn

@@ -2787,7 +2787,6 @@ if (is_android) {
       "//third_party/ub-uiautomator:ub_uiautomator_java",
     ]
     java_files = [
-      "test/android/javatests/src/org/chromium/base/test/BaseActivityInstrumentationTestCase.java",
       "test/android/javatests/src/org/chromium/base/test/BaseChromiumInstrumentationTestRunner.java",
       "test/android/javatests/src/org/chromium/base/test/BaseInstrumentationTestRunner.java",
       "test/android/javatests/src/org/chromium/base/test/BaseJUnit4ClassRunner.java",

base/test/android/javatests/src/org/chromium/base/test/BaseActivityInstrumentationTestCase.java

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-package org.chromium.base.test;
-
-import android.app.Activity;
-import android.support.annotation.CallSuper;
-import android.test.ActivityInstrumentationTestCase2;
-
-/**
- * Base class for all Activity-based Instrumentation tests.
- *
- * @param <T> The Activity type.
- */
-public class BaseActivityInstrumentationTestCase<T extends Activity>
-        extends ActivityInstrumentationTestCase2<T> {
-    /**
-     * Creates a instance for running tests against an Activity of the given class.
-     *
-     * @param activityClass The type of activity that will be tested.
-     */
-    public BaseActivityInstrumentationTestCase(Class<T> activityClass) {
-        super(activityClass);
-    }
-
-    @Override
-    @CallSuper
-    protected void setUp() throws Exception {
-        super.setUp();
-    }
-
-    @Override
-    @CallSuper
-    protected void tearDown() throws Exception {
-        super.tearDown();
-    }
-}