Remove pointer mangling API from trace_event.h and use an addTraceEvent flag instead

base/debug/trace_event_impl.cc

Index: base/debug/trace_event_impl.cc
diff --git a/base/debug/trace_event_impl.cc b/base/debug/trace_event_impl.cc
index a591bacfcd12db4d9011fa8a7cf83205afadfc6b..223e04bc3b0f21c34df0d600ad91e35fadf4daa7 100644
--- a/base/debug/trace_event_impl.cc
+++ b/base/debug/trace_event_impl.cc
@@ -595,6 +595,10 @@ int TraceLog::AddTraceEvent(char phase,
         return -1;
       }
     }
+
+    if (flags & TRACE_EVENT_FLAG_MANGLE_ID)
+      id ^= process_id_hash_;
+
     ret_begin_id = static_cast<int>(logged_events_.size());
     logged_events_.push_back(
         TraceEvent(thread_id,