Delete all use of tick_util.h.

webrtc/modules/video_coding/codecs/test/videoprocessor.h

Index: webrtc/modules/video_coding/codecs/test/videoprocessor.h
diff --git a/webrtc/modules/video_coding/codecs/test/videoprocessor.h b/webrtc/modules/video_coding/codecs/test/videoprocessor.h
index cd1c7b9d62c976adec279e0ea49e2c1d1605f536..f0322dd67b451f6fcc25b5304bae9ca56a525a83 100644
--- a/webrtc/modules/video_coding/codecs/test/videoprocessor.h
+++ b/webrtc/modules/video_coding/codecs/test/videoprocessor.h
@@ -19,7 +19,6 @@
 #include "webrtc/modules/video_coding/include/video_codec_interface.h"
 #include "webrtc/modules/video_coding/codecs/test/packet_manipulator.h"
 #include "webrtc/modules/video_coding/codecs/test/stats.h"
-#include "webrtc/system_wrappers/include/tick_util.h"
 #include "webrtc/test/testsupport/frame_reader.h"
 #include "webrtc/test/testsupport/frame_writer.h"
 #include "webrtc/video_frame.h"
@@ -179,8 +178,7 @@ class VideoProcessorImpl : public VideoProcessor {
   void FrameDecoded(const webrtc::VideoFrame& image);
   // Used for getting a 32-bit integer representing time
   // (checks the size is within signed 32-bit bounds before casting it)
-  int GetElapsedTimeMicroseconds(const webrtc::TickTime& start,
-                                 const webrtc::TickTime& stop);
+  int GetElapsedTimeMicroseconds(int64_t start, int64_t stop);
   // Updates the encoder with the target bit rate and the frame rate.
   void SetRates(int bit_rate, int frame_rate) override;
   // Return the size of the encoded frame in bytes.
@@ -225,8 +223,8 @@ class VideoProcessorImpl : public VideoProcessor {
 
   // Statistics
   double bit_rate_factor_;  // multiply frame length with this to get bit rate
-  webrtc::TickTime encode_start_;
-  webrtc::TickTime decode_start_;
+  int64_t encode_start_ns_;
+  int64_t decode_start_ns_;
 
   // Callback class required to implement according to the VideoEncoder API.
   class VideoProcessorEncodeCompleteCallback