Revert of Add creation of ServiceManager to Content

mojo/service_manager/service_loader.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 MOJO_SERVICE_MANAGER_SERVICE_LOADER_H_
 #define MOJO_SERVICE_MANAGER_SERVICE_LOADER_H_
 
 #include "mojo/public/shell/shell.mojom.h"
-#include "mojo/service_manager/service_manager_export.h"
 #include "url/gurl.h"
 
 namespace mojo {
 
 class ServiceManager;
 
 // Interface to allowing default loading behavior to be overridden for a
 // specific url.
-class MOJO_SERVICE_MANAGER_EXPORT ServiceLoader {
+class ServiceLoader {
  public:
   virtual ~ServiceLoader() {};
   virtual void LoadService(ServiceManager* manager,
                            const GURL& url,
                            ScopedShellHandle service_handle) = 0;
  protected:
   ServiceLoader() {}
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICE_MANAGER_SERVICE_LOADER_H_