Remove the useless ACMTest base class

Bug: webrtc:8396
Change-Id: I021a2429910b21ffe4829e0ed51b9290bc715c0c
Reviewed-on: https://webrtc-review.googlesource.com/102884
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24907}
diff --git a/modules/audio_coding/test/EncodeDecodeTest.h b/modules/audio_coding/test/EncodeDecodeTest.h
index 7a21cb5..9132d71 100644
--- a/modules/audio_coding/test/EncodeDecodeTest.h
+++ b/modules/audio_coding/test/EncodeDecodeTest.h
@@ -15,7 +15,6 @@
 #include <string.h>
 
 #include "modules/audio_coding/include/audio_coding_module.h"
-#include "modules/audio_coding/test/ACMTest.h"
 #include "modules/audio_coding/test/PCMFile.h"
 #include "modules/audio_coding/test/RTPFile.h"
 #include "modules/include/module_common_types.h"
@@ -95,10 +94,10 @@
   uint32_t _nextTime;
 };
 
-class EncodeDecodeTest : public ACMTest {
+class EncodeDecodeTest {
  public:
   explicit EncodeDecodeTest(int test_mode);
-  void Perform() override;
+  void Perform();
 
   uint16_t _playoutFreq;