Replace ChildProcess/AppChildProcess with a simple ChildMain().

shell/child_process.h

-// Copyright 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.
-
-#ifndef SHELL_CHILD_PROCESS_H_
-#define SHELL_CHILD_PROCESS_H_
-
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "mojo/edk/embedder/scoped_platform_handle.h"
-
-namespace base {
-class CommandLine;
-}
-
-namespace mojo {
-namespace shell {
-
-// A base class for child processes -- i.e., code that is actually run within
-// the child process. (Instances are manufactured by |Create()|.)
-class ChildProcess {
- public:
-  virtual ~ChildProcess();
-
-  // Returns null if the command line doesn't indicate that this is a child
-  // process. |main()| should call this, and if it returns non-null it should
-  // call |Main()| (without a message loop on the current thread).
-  static scoped_ptr<ChildProcess> Create(const base::CommandLine& command_line);
-
-  // To be implemented by subclasses. This is the "entrypoint" for a child
-  // process. Run with no message loop for the main thread.
-  virtual void Main() = 0;
-
- protected:
-  ChildProcess();
-
-  embedder::ScopedPlatformHandle* platform_channel() {
-    return &platform_channel_;
-  }
-
- private:
-  // Available in |Main()| (after a successful |Create()|).
-  embedder::ScopedPlatformHandle platform_channel_;
-
-  DISALLOW_COPY_AND_ASSIGN(ChildProcess);
-};
-
-}  // namespace shell
-}  // namespace mojo
-
-#endif  // SHELL_CHILD_PROCESS_H_