[DevTools] Move IO and Tracing to new generator.

content/browser/devtools/devtools_io_context.h

 // 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 <stddef.h>
 
 #include <map>
 
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/memory/ref_counted_delete_on_message_loop.h"
 #include "base/memory/ref_counted_memory.h"
 
 namespace content {
-namespace devtools {
 
 class DevToolsIOContext {
  public:
   class Stream : public base::RefCountedDeleteOnMessageLoop<Stream> {
    public:
     enum Status {
       StatusSuccess,
       StatusEOF,
       StatusFailure
     };
@@ skipping 28 matching lines @@
   scoped_refptr<Stream> CreateTempFileBackedStream();
   scoped_refptr<Stream> GetByHandle(const std::string& handle);
   bool Close(const std::string& handle);
   void DiscardAllStreams();
 
  private:
   using StreamsMap = std::map<std::string, scoped_refptr<Stream>>;
   StreamsMap streams_;
 };
 
-}  // namespace devtools
 }  // namespace content