Delete all use of tick_util.h.

webrtc/modules/desktop_capture/mac/full_screen_chrome_window_detector.cc

Index: webrtc/modules/desktop_capture/mac/full_screen_chrome_window_detector.cc
diff --git a/webrtc/modules/desktop_capture/mac/full_screen_chrome_window_detector.cc b/webrtc/modules/desktop_capture/mac/full_screen_chrome_window_detector.cc
index 2d3c2d90479183126ea3eea89c13a71874310e5c..9c75f7877c83b59d7d94378a6020e2022b063685 100644
--- a/webrtc/modules/desktop_capture/mac/full_screen_chrome_window_detector.cc
+++ b/webrtc/modules/desktop_capture/mac/full_screen_chrome_window_detector.cc
@@ -15,6 +15,7 @@
 #include <string>
 
 #include "webrtc/base/macutils.h"
+#include "webrtc/base/timeutils.h"
 #include "webrtc/modules/desktop_capture/mac/window_list_utils.h"
 #include "webrtc/system_wrappers/include/logging.h"
 
@@ -162,7 +163,7 @@ CGWindowID FullScreenChromeWindowDetector::FindFullScreenWindow(
       continue;
 
     int64_t time_interval =
-        (TickTime::Now() - last_udpate_time_).Milliseconds();
+        (rtc::TimeNanos() - last_update_time_) / rtc::kNumNanosecsPerMillisec;
     LOG(LS_WARNING) << "The full-screen window exists in the list, "
                     << "which was updated " << time_interval << "ms ago.";
     return kCGNullWindowID;
@@ -186,7 +187,7 @@ void FullScreenChromeWindowDetector::UpdateWindowListIfNeeded(
     }
 
     GetWindowList(&current_window_list_);
-    last_udpate_time_ = TickTime::Now();
+    last_udpate_time_ = rtc::TimeNanos();
   }
 }