Kills TraceTicks, which was functionally the same as TimeTicks

base/trace_event/trace_event_impl.cc

Index: base/trace_event/trace_event_impl.cc
diff --git a/base/trace_event/trace_event_impl.cc b/base/trace_event/trace_event_impl.cc
index c5851a3996782b4b5b568930eddc9df7c7f4c790..0c742cd4bd70c855292c4d974b810d036b7cb9c1 100644
--- a/base/trace_event/trace_event_impl.cc
+++ b/base/trace_event/trace_event_impl.cc
@@ -75,7 +75,7 @@ void TraceEvent::CopyFrom(const TraceEvent& other) {
 
 void TraceEvent::Initialize(
     int thread_id,
-    TraceTicks timestamp,
+    TimeTicks timestamp,
     ThreadTicks thread_timestamp,
     char phase,
     const unsigned char* category_group_enabled,
@@ -173,7 +173,7 @@ void TraceEvent::Reset() {
     convertable_values_[i] = NULL;
 }
 
-void TraceEvent::UpdateDuration(const TraceTicks& now,
+void TraceEvent::UpdateDuration(const TimeTicks& now,
                                 const ThreadTicks& thread_now) {
   DCHECK_EQ(duration_.ToInternalValue(), -1);
   duration_ = now - timestamp_;