Move tracing namespace from base::debug to base::trace_event.

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index faf4399fdca63b940aa59b4f123d339c7b9dcab0..68687fbdd49e603b1f9b7518cbb1d52a9e49084b 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -24,9 +24,12 @@
 #include "cc/scheduler/scheduler_state_machine.h"
 
 namespace base {
-namespace debug {
+namespace trace_event {
 class ConvertableToTraceFormat;
 }
+namespace debug {
+using ::base::trace_event::ConvertableToTraceFormat;
+}

[Primiano Tucci (use gerrit), 2015/01/27 14:34:11]

nit: blankline

 class SingleThreadTaskRunner;
 }