Remove unused voe_cpu_test.cc.

webrtc/voice_engine/test/auto_test/voe_cpu_test.h

-/*
- *  Copyright (c) 2011 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.
- */
-
-#ifndef WEBRTC_VOICE_ENGINE_VOE_CPU_TEST_H
-#define WEBRTC_VOICE_ENGINE_VOE_CPU_TEST_H
-
-#include "webrtc/voice_engine/test/auto_test/voe_standard_test.h"
-
-namespace voetest {
-
-class VoETestManager;
-
-class VoECpuTest {
- public:
-  VoECpuTest(VoETestManager& mgr);
-  ~VoECpuTest() {}
-  int DoTest();
- private:
-  VoETestManager& _mgr;
-};
-
-}  // namespace voetest
-
-#endif // WEBRTC_VOICE_ENGINE_VOE_CPU_TEST_H