Revert of Delete class MockCongestionController.

webrtc/modules/congestion_controller/include/mock/mock_congestion_observer.h

Index: webrtc/modules/congestion_controller/include/mock/mock_congestion_observer.h
diff --git a/webrtc/modules/congestion_controller/include/mock/mock_congestion_observer.h b/webrtc/modules/congestion_controller/include/mock/mock_congestion_observer.h
deleted file mode 100644
index 7b4c7f2ecf591500d5acd086e29c4470a780a734..0000000000000000000000000000000000000000
--- a/webrtc/modules/congestion_controller/include/mock/mock_congestion_observer.h
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- *  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.
- */
-
-#ifndef WEBRTC_MODULES_CONGESTION_CONTROLLER_INCLUDE_MOCK_MOCK_CONGESTION_OBSERVER_H_
-#define WEBRTC_MODULES_CONGESTION_CONTROLLER_INCLUDE_MOCK_MOCK_CONGESTION_OBSERVER_H_
-
-#include "webrtc/base/constructormagic.h"
-#include "webrtc/base/socket.h"
-#include "webrtc/common_types.h"
-#include "webrtc/modules/congestion_controller/include/congestion_controller.h"
-#include "webrtc/test/gmock.h"
-
-namespace webrtc {
-namespace test {
-
-class MockCongestionObserver : public CongestionController::Observer {
- public:
-  MOCK_METHOD4(OnNetworkChanged,
-               void(uint32_t bitrate_bps,
-                    uint8_t fraction_loss,
-                    int64_t rtt_ms,
-                    int64_t probing_interval_ms));
-};
-
-}  // namespace test
-}  // namespace webrtc
-#endif  // WEBRTC_MODULES_CONGESTION_CONTROLLER_INCLUDE_MOCK_MOCK_CONGESTION_OBSERVER_H_