Kills TraceTicks, which was functionally the same as TimeTicks

ipc/ipc_message_utils.h

Index: ipc/ipc_message_utils.h
diff --git a/ipc/ipc_message_utils.h b/ipc/ipc_message_utils.h
index 1e2832fcaa524d56b4677dbb264c5bf1a51b191c..817d752a66c103ef841b779304a2183c5faf5d40 100644
--- a/ipc/ipc_message_utils.h
+++ b/ipc/ipc_message_utils.h
@@ -59,7 +59,6 @@ class NullableString16;
 class Time;
 class TimeDelta;
 class TimeTicks;
-class TraceTicks;
 struct FileDescriptor;
 
 #if (defined(OS_MACOSX) && !defined(OS_IOS)) || defined(OS_WIN)
@@ -585,16 +584,6 @@ struct IPC_EXPORT ParamTraits<base::TimeTicks> {
 };
 
 template <>
-struct IPC_EXPORT ParamTraits<base::TraceTicks> {
-  typedef base::TraceTicks param_type;
-  static void Write(Message* m, const param_type& p);
-  static bool Read(const Message* m,
-                   base::PickleIterator* iter,
-                   param_type* r);
-  static void Log(const param_type& p, std::string* l);
-};
-
-template <>
 struct ParamTraits<base::Tuple<>> {
   typedef base::Tuple<> param_type;
   static void Write(Message* m, const param_type& p) {