Delete NullEventFactory

A preparation for deleting EventFactory and EventWrapper, to instead
use rtc::Event directly.

Bug: webrtc:3380
Change-Id: I4c40daca9268e57b06d506d91e09365091c42ad6
Reviewed-on: https://webrtc-review.googlesource.com/c/109880
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25545}

modules/video_coding/test/test_util.h

@@ -1,34 +0,0 @@
-/*
- *  Copyright (c) 2012 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 MODULES_VIDEO_CODING_TEST_TEST_UTIL_H_
-#define MODULES_VIDEO_CODING_TEST_TEST_UTIL_H_
-
-#include "system_wrappers/include/event_wrapper.h"
-
-class NullEventFactory : public webrtc::EventFactory {
- public:
-  virtual ~NullEventFactory() {}
-
-  webrtc::EventWrapper* CreateEvent() override { return new NullEvent; }
-
- private:
-  // Private class to avoid more dependencies on it in tests.
-  class NullEvent : public webrtc::EventWrapper {
-   public:
-    ~NullEvent() override {}
-    bool Set() override { return true; }
-    webrtc::EventTypeWrapper Wait(unsigned long max_time) override {  // NOLINT
-      return webrtc::kEventTimeout;
-    }
-  };
-};
-
-#endif  // MODULES_VIDEO_CODING_TEST_TEST_UTIL_H_