Delete all use of tick_util.h.

webrtc/modules/desktop_capture/screen_capturer_x11.cc

Index: webrtc/modules/desktop_capture/screen_capturer_x11.cc
diff --git a/webrtc/modules/desktop_capture/screen_capturer_x11.cc b/webrtc/modules/desktop_capture/screen_capturer_x11.cc
index 65e682b6f8bdc1bd28ba99d515077122fc105adb..e87729ba9ccc6a431e700b057e8de80879f7558d 100644
--- a/webrtc/modules/desktop_capture/screen_capturer_x11.cc
+++ b/webrtc/modules/desktop_capture/screen_capturer_x11.cc
@@ -21,6 +21,7 @@
 #include <X11/Xutil.h>
 
 #include "webrtc/base/checks.h"
+#include "webrtc/base/timeutils.h"
 #include "webrtc/modules/desktop_capture/desktop_capture_options.h"
 #include "webrtc/modules/desktop_capture/desktop_frame.h"
 #include "webrtc/modules/desktop_capture/differ.h"
@@ -28,7 +29,6 @@
 #include "webrtc/modules/desktop_capture/screen_capturer_helper.h"
 #include "webrtc/modules/desktop_capture/x11/x_server_pixel_buffer.h"
 #include "webrtc/system_wrappers/include/logging.h"
-#include "webrtc/system_wrappers/include/tick_util.h"
 
 namespace webrtc {
 namespace {
@@ -234,7 +234,7 @@ void ScreenCapturerLinux::Start(Callback* callback) {
 }
 
 void ScreenCapturerLinux::Capture(const DesktopRegion& region) {
-  TickTime capture_start_time = TickTime::Now();
+  int64_t capture_start_time_nanos = rtc::TimeNanos();
 
   queue_.MoveToNextFrame();
 
@@ -274,7 +274,8 @@ void ScreenCapturerLinux::Capture(const DesktopRegion& region) {
   DesktopFrame* result = CaptureScreen();
   last_invalid_region_ = result->updated_region();
   result->set_capture_time_ms(
-      (TickTime::Now() - capture_start_time).Milliseconds());
+      (rtc::TimeNanos() - capture_start_time_nanos) /
+      rtc::kNumNanosecsPerMillisec);
   callback_->OnCaptureCompleted(result);
 }