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

base/trace_event/trace_event_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/trace_event/trace_event_impl.h"
 
 #include <algorithm>
 
 #include "base/base_switches.h"
 #include "base/bind.h"
@@ skipping 23 matching lines @@
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_synthetic_delay.h"
 
 #if defined(OS_WIN)
 #include "base/trace_event/trace_event_win.h"
 #endif
 
 class DeleteTraceLogForTesting {
  public:
   static void Delete() {
-    Singleton<base::trace_event::TraceLog,
-              LeakySingletonTraits<base::trace_event::TraceLog>>::OnExit(0);
+    Singleton<base::debug::TraceLog,
+              LeakySingletonTraits<base::debug::TraceLog> >::OnExit(0);
   }
 };
 
 // The thread buckets for the sampling profiler.
 BASE_EXPORT TRACE_EVENT_API_ATOMIC_WORD g_trace_state[3];
 
 namespace base {
-namespace trace_event {
+namespace debug {
 
 namespace {
 
 // The overhead of TraceEvent above this threshold will be reported in the
 // trace.
 const int kOverheadReportThresholdInMicroseconds = 50;
 
 // String options that can be used to initialize TraceOptions.
 const char kRecordUntilFull[] = "record-until-full";
 const char kRecordContinuously[] = "record-continuously";
@@ skipping 2489 matching lines @@
   included_.clear();
   disabled_.clear();
   excluded_.clear();
 }
 
 const CategoryFilter::StringList&
     CategoryFilter::GetSyntheticDelayValues() const {
   return delays_;
 }
 
-}  // namespace trace_event
+}  // namespace debug
 }  // namespace base
 
 namespace trace_event_internal {
 
 ScopedTraceBinaryEfficient::ScopedTraceBinaryEfficient(
     const char* category_group, const char* name) {
   // The single atom works because for now the category_group can only be "gpu".
   DCHECK(strcmp(category_group, "gpu") == 0);
   static TRACE_EVENT_API_ATOMIC_WORD atomic = 0;
   INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO_CUSTOM_VARIABLES(
@@ skipping 11 matching lines @@
 }
 
 ScopedTraceBinaryEfficient::~ScopedTraceBinaryEfficient() {
   if (*category_group_enabled_) {
     TRACE_EVENT_API_UPDATE_TRACE_EVENT_DURATION(category_group_enabled_,
                                                 name_, event_handle_);
   }
 }
 
 }  // namespace trace_event_internal