First pass at content shell for the Mac. Doesn't work yet.

content/shell/shell_main_delegate.h

 // 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.
 
 #ifndef CONTENT_SHELL_SHELL_MAIN_DELEGATE_H_
 #define CONTENT_SHELL_SHELL_MAIN_DELEGATE_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/shell/shell_content_client.h"
 #include "content/public/app/content_main_delegate.h"
 
 namespace content {
 class ShellContentBrowserClient;
 class ShellContentRendererClient;
 class ShellContentPluginClient;
 class ShellContentUtilityClient;
 }  // namespace content
 
-class ShellMainDelegate : public content::ContentMainDelegate {
+class
+#if defined(OS_MACOSX)
+__attribute__((visibility("default")))
+#endif  // OS_MACOSX
+ShellMainDelegate : public content::ContentMainDelegate {
  public:
   ShellMainDelegate();
   virtual ~ShellMainDelegate();
 
   virtual bool BasicStartupComplete(int* exit_code) OVERRIDE;
   virtual void PreSandboxStartup() OVERRIDE;
   virtual void SandboxInitialized(const std::string& process_type) OVERRIDE;
   virtual int RunProcess(
       const std::string& process_type,
       const content::MainFunctionParams& main_function_params) OVERRIDE;
@@ skipping 16 matching lines @@
   scoped_ptr<content::ShellContentBrowserClient> browser_client_;
   scoped_ptr<content::ShellContentRendererClient> renderer_client_;
   scoped_ptr<content::ShellContentPluginClient> plugin_client_;
   scoped_ptr<content::ShellContentUtilityClient> utility_client_;
   content::ShellContentClient content_client_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellMainDelegate);
 };
 
 #endif  // CONTENT_SHELL_SHELL_MAIN_DELEGATE_H_