Revert of rewrite frame generator capturer to use TaskQueue instead of EventTimeWrapper

webrtc/test/frame_generator_capturer.h

Index: webrtc/test/frame_generator_capturer.h
diff --git a/webrtc/test/frame_generator_capturer.h b/webrtc/test/frame_generator_capturer.h
index fda16fc518479f6d3f084bf0a2ac182a9169e60a..dfd12711d187988560178bc90082b1e4788d472f 100644
--- a/webrtc/test/frame_generator_capturer.h
+++ b/webrtc/test/frame_generator_capturer.h
@@ -15,7 +15,7 @@
 
 #include "webrtc/api/video/video_frame.h"
 #include "webrtc/base/criticalsection.h"
-#include "webrtc/base/task_queue.h"
+#include "webrtc/base/platform_thread.h"
 #include "webrtc/test/video_capturer.h"
 #include "webrtc/typedefs.h"
 
@@ -74,8 +74,6 @@
   bool Init();
 
  private:
-  class InsertFrameTask;
-
   void InsertFrame();
   static bool Run(void* obj);
 
@@ -84,8 +82,9 @@
   rtc::VideoSinkInterface<VideoFrame>* sink_ GUARDED_BY(&lock_);
   SinkWantsObserver* sink_wants_observer_ GUARDED_BY(&lock_);
 
-  rtc::TaskQueue task_queue_;
+  std::unique_ptr<EventTimerWrapper> tick_;
   rtc::CriticalSection lock_;
+  rtc::PlatformThread thread_;
   std::unique_ptr<FrameGenerator> frame_generator_;
 
   int target_fps_;
@@ -93,7 +92,7 @@
 
   int64_t first_frame_capture_time_;
 };
-}  // namespace test
-}  // namespace webrtc
+}  // test
+}  // webrtc
 
 #endif  // WEBRTC_TEST_FRAME_GENERATOR_CAPTURER_H_