Delete all use of tick_util.h.

webrtc/system_wrappers/source/tick_util.cc

Index: webrtc/system_wrappers/source/tick_util.cc
diff --git a/webrtc/system_wrappers/source/tick_util.cc b/webrtc/system_wrappers/source/tick_util.cc
index 0485e429211a114f48ebe6900a8c558850531f63..7b0d1747ae2daf116f63050f7ee0e3f66a33c5ad 100644
--- a/webrtc/system_wrappers/source/tick_util.cc
+++ b/webrtc/system_wrappers/source/tick_util.cc
@@ -8,35 +8,4 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "webrtc/system_wrappers/include/tick_util.h"
-
-#include "webrtc/base/timeutils.h"
-
-namespace webrtc {
-
-int64_t TickTime::MillisecondTimestamp() {
-  return TicksToMilliseconds(TickTime::Now().Ticks());
-}
-
-int64_t TickTime::MicrosecondTimestamp() {
-  return TicksToMicroseconds(TickTime::Now().Ticks());
-}
-
-int64_t TickTime::MillisecondsToTicks(const int64_t ms) {
-  return ms * rtc::kNumNanosecsPerMillisec;
-}
-
-int64_t TickTime::TicksToMilliseconds(const int64_t ticks) {
-  return ticks / rtc::kNumNanosecsPerMillisec;
-}
-
-int64_t TickTime::TicksToMicroseconds(const int64_t ticks) {
-  return ticks / rtc::kNumNanosecsPerMicrosec;
-}
-
-// Gets the native system tick count, converted to nanoseconds.
-int64_t TickTime::QueryOsForTicks() {
-  return rtc::TimeNanos();
-}
-
-}  // namespace webrtc
+// TODO(nisse): Delete file. May need update of Chrome build files.