Revert of Disable failing modules_unittests for UBSan.

webrtc/modules/audio_processing/test/debug_dump_test.cc

Index: webrtc/modules/audio_processing/test/debug_dump_test.cc
diff --git a/webrtc/modules/audio_processing/test/debug_dump_test.cc b/webrtc/modules/audio_processing/test/debug_dump_test.cc
index f68c175e5d9df82cb7435ec0bf99d3b93fff0abc..3acb69444d9334d2575d4ea813e449138775e751 100644
--- a/webrtc/modules/audio_processing/test/debug_dump_test.cc
+++ b/webrtc/modules/audio_processing/test/debug_dump_test.cc
@@ -262,8 +262,6 @@
   }
 }
 
-// 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);
@@ -527,7 +525,5 @@
   VerifyDebugDump(generator.dump_file_name());
 }
 
-#endif  // !UNDEFINED_SANITIZER
-
 }  // namespace test
 }  // namespace webrtc