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

base/trace_event/trace_event_impl_constants.cc

Index: base/trace_event/trace_event_impl_constants.cc
diff --git a/base/trace_event/trace_event_impl_constants.cc b/base/trace_event/trace_event_impl_constants.cc
index c46cf49fdb84cbc573a19dc41eaefc50a3745974..c1f6aabbf5d0b063aa5ae2bd0819d8f608cebc89 100644
--- a/base/trace_event/trace_event_impl_constants.cc
+++ b/base/trace_event/trace_event_impl_constants.cc
@@ -5,9 +5,9 @@
 #include "base/trace_event/trace_event_impl.h"
 
 namespace base {
-namespace debug {
+namespace trace_event {
 
-// Enable everything but debug and test categories by default.
+// Enable everything but trace_event and test categories by default.

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

Revert this

[ssid, 2015/01/27 15:56:45]

Done.

 const char CategoryFilter::kDefaultCategoryFilterString[] = "-*Debug,-*Test";
 
 // Constant used by TraceLog's internal implementation of trace_option.
@@ -24,5 +24,5 @@ const TraceLog::InternalTraceOptions
 const TraceLog::InternalTraceOptions
     TraceLog::kInternalRecordAsMuchAsPossible = 1 << 4;
 
-}  // namespace debug
+}  // namespace trace_event
 }  // namespace base