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

base/trace_event/trace_event_win.h

Index: base/trace_event/trace_event_win.h
diff --git a/base/trace_event/trace_event_win.h b/base/trace_event/trace_event_win.h
index e447c35db8b2700f92690822d5516e912a4e4cba..416136155490f9fd94971b90b0ca4ead8492a69c 100644
--- a/base/trace_event/trace_event_win.h
+++ b/base/trace_event/trace_event_win.h
@@ -17,7 +17,7 @@ template <typename Type>
 struct StaticMemorySingletonTraits;
 
 namespace base {
-namespace debug {
+namespace trace_event {
 
 // This EtwTraceProvider subclass implements ETW logging
 // for the macros above on Windows.
@@ -119,7 +119,7 @@ enum TraceEventETWFlags {
 // Optionally the stack trace, consisting of a DWORD "depth", followed
 //    by an array of void* (machine bitness) of length "depth".
 
-}  // namespace debug
+}  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_TRACE_EVENT_WIN_H_