Make ChildProcessHost be used through an interface in content/public, instead of by inheritence.

chrome/service/service_utility_process_host.h

 // Copyright (c) 2011 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 CHROME_SERVICE_SERVICE_UTILITY_PROCESS_HOST_H_
 #define CHROME_SERVICE_SERVICE_UTILITY_PROCESS_HOST_H_
 #pragma once
 
 #include "build/build_config.h"
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/process.h"
 #include "base/task.h"
 #include "ipc/ipc_channel.h"
 #include "content/public/common/child_process_host_delegate.h"
 #include "printing/pdf_render_settings.h"
 
-class ChildProcessHost;
 class CommandLine;
 class ScopedTempDir;
 
 namespace base {
 class MessageLoopProxy;
 }  // namespace base
 
+namespace content {
+class ChildProcessHost;
+}
+
 namespace printing {
 class Emf;
 struct PageRange;
 struct PrinterCapsAndDefaults;
 }  // namespace printing
 
 // Acts as the service-side host to a utility child process. A
 // utility process is a short-lived sandboxed process that is created to run
 // a specific task.
 class ServiceUtilityProcessHost : public content::ChildProcessHostDelegate {
@@ skipping 86 matching lines @@
   base::ProcessHandle handle() const { return handle_; }
 
   // Messages handlers:
   void OnRenderPDFPagesToMetafileSucceeded(int highest_rendered_page_number);
   void OnRenderPDFPagesToMetafileFailed();
   void OnGetPrinterCapsAndDefaultsSucceeded(
       const std::string& printer_name,
       const printing::PrinterCapsAndDefaults& caps_and_defaults);
   void OnGetPrinterCapsAndDefaultsFailed(const std::string& printer_name);
 
-  scoped_ptr<ChildProcessHost> child_process_host_;
+  scoped_ptr<content::ChildProcessHost> child_process_host_;
   base::ProcessHandle handle_;
   // A pointer to our client interface, who will be informed of progress.
   scoped_refptr<Client> client_;
   scoped_refptr<base::MessageLoopProxy> client_message_loop_proxy_;
   bool waiting_for_reply_;
   // The path to the temp file where the metafile will be written to.
   FilePath metafile_path_;
   // The temporary folder created for the metafile.
   scoped_ptr<ScopedTempDir> scratch_metafile_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceUtilityProcessHost);
 };
 
 #endif  // CHROME_SERVICE_SERVICE_UTILITY_PROCESS_HOST_H_