Move shell service to toplevel shell namespace

services/shell/standalone/tracer.cc

 // Copyright 2015 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 "services/shell/standalone/tracer.h"
 
 #include <stddef.h>
 #include <stdio.h>
 #include <string.h>
 #include <utility>
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
 #include "base/trace_event/trace_config.h"
 #include "base/trace_event/trace_event.h"
 
-namespace mojo {
 namespace shell {
 
 Tracer::Tracer()
     : tracing_(false), first_chunk_written_(false), trace_file_(nullptr) {}
 
 Tracer::~Tracer() {
   StopAndFlushToFile();
 }
 
 void Tracer::Start(const std::string& categories,
@@ skipping 124 matching lines @@
   WriteFooterAndClose();
 }
 
 void Tracer::WriteCommaIfNeeded() {
   if (first_chunk_written_)
     PCHECK(fwrite(",", 1, 1, trace_file_) == 1);
   first_chunk_written_ = true;
 }
 
 }  // namespace shell
-}  // namespace mojo