Delete all use of tick_util.h.

webrtc/common_video/libyuv/scaler_unittest.cc

Index: webrtc/common_video/libyuv/scaler_unittest.cc
diff --git a/webrtc/common_video/libyuv/scaler_unittest.cc b/webrtc/common_video/libyuv/scaler_unittest.cc
index 9ba1b9d94f36f1f4ea3cafdbe9529aaf6b3b13ef..4fb417fb2d403ab2e88daee73847ea024ba38a7e 100644
--- a/webrtc/common_video/libyuv/scaler_unittest.cc
+++ b/webrtc/common_video/libyuv/scaler_unittest.cc
@@ -14,8 +14,8 @@
 #include <memory>
 
 #include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/base/timeutils.h"
 #include "webrtc/common_video/libyuv/include/scaler.h"
-#include "webrtc/system_wrappers/include/tick_util.h"
 #include "webrtc/test/testsupport/fileutils.h"
 
 namespace webrtc {
@@ -378,9 +378,9 @@ void TestScaler::ScaleSequence(ScaleMethod method,
                             (src_width + 1) / 2,
                             kVideoRotation_0);
 
-    start_clock = TickTime::MillisecondTimestamp();
+    start_clock = rtc::Time64();
     EXPECT_EQ(0, test_scaler_.Scale(input_frame, &output_frame));
-    total_clock += TickTime::MillisecondTimestamp() - start_clock;
+    total_clock += rtc::Time64() - start_clock;
     if (PrintVideoFrame(output_frame, output_file) < 0) {
         return;
     }