Revert of - Clean up unused voice engine DTMF code.

webrtc/voice_engine/dtmf_inband_queue.h

Index: webrtc/voice_engine/dtmf_inband_queue.h
diff --git a/webrtc/voice_engine/dtmf_inband_queue.h b/webrtc/voice_engine/dtmf_inband_queue.h
new file mode 100644
index 0000000000000000000000000000000000000000..08e8018316d88d9324d5fa970f470245ec209661
--- /dev/null
+++ b/webrtc/voice_engine/dtmf_inband_queue.h
@@ -0,0 +1,50 @@
+/*
+ *  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_DTMF_INBAND_QUEUE_H
+#define WEBRTC_VOICE_ENGINE_DTMF_INBAND_QUEUE_H
+
+#include "webrtc/base/criticalsection.h"
+#include "webrtc/typedefs.h"
+#include "webrtc/voice_engine/voice_engine_defines.h"
+
+
+namespace webrtc {
+
+class DtmfInbandQueue
+{
+public:
+
+    DtmfInbandQueue(int32_t id);
+
+    virtual ~DtmfInbandQueue();
+
+    int AddDtmf(uint8_t DtmfKey, uint16_t len, uint8_t level);
+
+    int8_t NextDtmf(uint16_t* len, uint8_t* level);
+
+    bool PendingDtmf();
+
+    void ResetDtmf();
+
+private:
+    enum {kDtmfInbandMax = 20};
+
+    int32_t _id;
+    rtc::CriticalSection _DtmfCritsect;
+    uint8_t _nextEmptyIndex;
+    uint8_t _DtmfKey[kDtmfInbandMax];
+    uint16_t _DtmfLen[kDtmfInbandMax];
+    uint8_t _DtmfLevel[kDtmfInbandMax];
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_VOICE_ENGINE_DTMF_INBAND_QUEUE_H