Revert of Disable failing modules_unittests for UBSan.

webrtc/modules/audio_processing/test/debug_dump_test.cc

 /*
  *  Copyright (c) 2015 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.
  */
 
@@ skipping 244 matching lines @@
                 msg->output_channel(0).size());
       for (int i = 0; i < msg->output_channel_size(); ++i) {
         ASSERT_EQ(0, memcmp(output->channels()[i],
                             msg->output_channel(i).data(),
                             msg->output_channel(i).size()));
       }
     }
   }
 }
 
-// Disabled for UBSan: https://bugs.chromium.org/p/webrtc/issues/detail?id=5820
-#ifndef UNDEFINED_SANITIZER
 TEST_F(DebugDumpTest, SimpleCase) {
   Config config;
   DebugDumpGenerator generator(config);
   generator.StartRecording();
   generator.Process(100);
   generator.StopRecording();
   VerifyDebugDump(generator.dump_file_name());
 }
 
 TEST_F(DebugDumpTest, ChangeInputFormat) {
@@ skipping 243 matching lines @@
 TEST_F(DebugDumpTest, TransientSuppressionOn) {
   Config config;
   config.Set<ExperimentalNs>(new ExperimentalNs(true));
   DebugDumpGenerator generator(config);
   generator.StartRecording();
   generator.Process(100);
   generator.StopRecording();
   VerifyDebugDump(generator.dump_file_name());
 }
 
-#endif  // !UNDEFINED_SANITIZER
-
 }  // namespace test
 }  // namespace webrtc