Kills TraceTicks, which was functionally the same as TimeTicks

base/time/time.cc

Index: base/time/time.cc
diff --git a/base/time/time.cc b/base/time/time.cc
index 10ffcc606651b9a2e7ab147620d30cdb9351a443..53851fb18c5bc371080d8f074730a701ba57a5e5 100644
--- a/base/time/time.cc
+++ b/base/time/time.cc
@@ -326,11 +326,6 @@ std::ostream& operator<<(std::ostream& os, ThreadTicks thread_ticks) {
   return os << as_time_delta.InMicroseconds() << " bogo-thread-microseconds";
 }
 
-std::ostream& operator<<(std::ostream& os, TraceTicks trace_ticks) {
-  const TimeDelta as_time_delta = trace_ticks - TraceTicks();
-  return os << as_time_delta.InMicroseconds() << " bogo-trace-microseconds";
-}
-
 // Time::Exploded -------------------------------------------------------------
 
 inline bool is_in_range(int value, int lo, int hi) {