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

base/trace_event/trace_event_argument_unittest.cc

 // Copyright (c) 2014 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_argument.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
-namespace debug {
+namespace trace_event {
 
 TEST(TraceEventArgumentTest, FlatDictionary) {
   scoped_refptr<TracedValue> value = new TracedValue();
   value->SetInteger("int", 2014);
   value->SetDouble("double", 0.0);
   value->SetBoolean("bool", true);
   value->SetString("string", "string");
   std::string json;
   value->AppendAsTraceFormat(&json);
   EXPECT_EQ("{\"bool\":true,\"double\":0.0,\"int\":2014,\"string\":\"string\"}",
@@ skipping 22 matching lines @@
   value->SetString("s0", "foo");
   std::string json;
   value->AppendAsTraceFormat(&json);
   EXPECT_EQ(
       "{\"a1\":[1,true,{\"i2\":3}],\"b0\":true,\"d0\":0.0,\"dict1\":{\"dict2\":"
       "{\"b2\":false},\"i1\":2014,\"s1\":\"foo\"},\"i0\":2014,\"s0\":"
       "\"foo\"}",
       json);
 }
 
-}  // namespace debug
+}  // namespace trace_event
 }  // namespace base