Run app_shell on Windows.

extensions/shell/app/shell_main_delegate.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 EXTENSIONS_SHELL_APP_SHELL_MAIN_DELEGATE_H_
 #define EXTENSIONS_SHELL_APP_SHELL_MAIN_DELEGATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/app/content_main_delegate.h"
@@ skipping 12 matching lines @@
  public:
   ShellMainDelegate();
   virtual ~ShellMainDelegate();
 
   // ContentMainDelegate implementation:
   virtual bool BasicStartupComplete(int* exit_code) OVERRIDE;
   virtual void PreSandboxStartup() OVERRIDE;
   virtual content::ContentBrowserClient* CreateContentBrowserClient() OVERRIDE;
   virtual content::ContentRendererClient* CreateContentRendererClient()
       OVERRIDE;
+#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_ANDROID)
   virtual void ZygoteStarting(
       ScopedVector<content::ZygoteForkDelegate>* delegates) OVERRIDE;
+#endif
 
  protected:
   // The created object is owned by this object.
   virtual content::ContentClient* CreateContentClient();
   virtual content::ContentBrowserClient* CreateShellContentBrowserClient();
   virtual content::ContentRendererClient* CreateShellContentRendererClient();
 
   // Initializes the resource bundle and resources.pak.
   virtual void InitializeResourceBundle();
 
  private:
   // |process_type| is zygote, renderer, utility, etc. Returns true if the
   // process needs data from resources.pak.
   static bool ProcessNeedsResourceBundle(const std::string& process_type);
 
   scoped_ptr<content::ContentClient> content_client_;
   scoped_ptr<content::ContentBrowserClient> browser_client_;
   scoped_ptr<content::ContentRendererClient> renderer_client_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellMainDelegate);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_SHELL_APP_SHELL_MAIN_DELEGATE_H_