Revert "Add regression test for b/171867367"

This reverts commit 0935bba196a60f6ddd4bdf4a974df8a856b1ac3f.

Reason for revert: failing on 5.1.1 and 6

Change-Id: Ie1c4f30bb2b93e5b11394b65c18158dbdc28cc8f
diff --git a/src/test/java/com/android/tools/r8/desugaring/interfacemethods/Regress171867367.java b/src/test/java/com/android/tools/r8/desugaring/interfacemethods/Regress171867367.java
deleted file mode 100644
index 09c20c3..0000000
--- a/src/test/java/com/android/tools/r8/desugaring/interfacemethods/Regress171867367.java
+++ /dev/null
@@ -1,98 +0,0 @@
-// Copyright (c) 2020, the R8 project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-package com.android.tools.r8.desugaring.interfacemethods;
-
-import static org.junit.Assert.assertThrows;
-
-import com.android.tools.r8.CompilationFailedException;
-import com.android.tools.r8.D8TestBuilder;
-import com.android.tools.r8.TestBase;
-import com.android.tools.r8.TestParameters;
-import com.android.tools.r8.utils.AndroidApiLevel;
-import java.nio.file.Path;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.List;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.junit.runners.Parameterized;
-
-@RunWith(Parameterized.class)
-public class Regress171867367 extends TestBase {
-
-  private final TestParameters parameters;
-
-  @Parameterized.Parameters(name = "{0}")
-  public static List<Object[]> data() {
-    return buildParameters(
-        getTestParameters().withAllRuntimes().withAllApiLevelsAlsoForCf().build());
-  }
-
-  public Regress171867367(TestParameters parameters) {
-    this.parameters = parameters;
-  }
-
-  @Test
-  public void test() throws Exception {
-    Path path =
-        testForD8(Backend.CF)
-            .addProgramClasses(TestClass.class)
-            .setMinApi(parameters.getApiLevel())
-            .compile()
-            .writeToZip();
-    D8TestBuilder d8TestBuilder =
-        testForD8(parameters.getBackend())
-            .addProgramFiles(path)
-            .addProgramClasses(TestClass2.class)
-            .setMinApi(parameters.getApiLevel());
-    if (parameters.getApiLevel().isLessThan(AndroidApiLevel.L)) {
-      // TODO(b/171867367): Make us not fail when desugaring mixed (desugared and non desugared)
-      // inputs introduce a synthetic already present in the program input.
-      assertThrows(CompilationFailedException.class, d8TestBuilder::compile);
-    } else {
-      d8TestBuilder.run(TestClass.class).assertSuccessWithOutputLines("42", "43", "45");
-    }
-  }
-
-  static class TestClass {
-    public static void main(String[] args) {
-      List<Integer> values = new ArrayList<>();
-      values.add(42);
-      values.add(45);
-      values.add(43);
-      // Comparator.nulls{First,Last} are static interface methods, will trigger the CC class.
-      Collections.sort(
-          values,
-          Comparator.nullsFirst(
-              (a, b) -> {
-                return Integer.compare(a, b);
-              }));
-      Collections.sort(
-          values,
-          Comparator.nullsLast(
-              (a, b) -> {
-                return Integer.compare(a, b);
-              }));
-      for (Integer value : values) {
-        System.out.println(value);
-      }
-    }
-  }
-
-  static class TestClass2 {
-    public static void foo() {
-      List<Integer> values = new ArrayList<>();
-      values.add(142);
-      values.add(145);
-      values.add(143);
-      Collections.sort(
-          values,
-          Comparator.nullsFirst(
-              (a, b) -> {
-                return Integer.compare(a, b);
-              }));
-    }
-  }
-}