Create an API around UtilityProcessHost and use that from chrome.

chrome/browser/extensions/sandboxed_extension_unpacker.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_BROWSER_EXTENSIONS_SANDBOXED_EXTENSION_UNPACKER_H_
 #define CHROME_BROWSER_EXTENSIONS_SANDBOXED_EXTENSION_UNPACKER_H_
 #pragma once
 
 #include <string>
 
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/scoped_temp_dir.h"
 #include "chrome/common/extensions/extension.h"
-#include "content/browser/utility_process_host.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/utility_process_host_client.h"
 
 class Extension;
 class ResourceDispatcherHost;
 
 namespace base {
 class DictionaryValue;
 }
 
 class SandboxedExtensionUnpackerClient
     : public base::RefCountedThreadSafe<SandboxedExtensionUnpackerClient> {
@@ skipping 34 matching lines @@
 // Lifetime management:
 //
 // This class is ref-counted by each call it makes to itself on another thread,
 // and by UtilityProcessHost.
 //
 // Additionally, we hold a reference to our own client so that it lives at least
 // long enough to receive the result of unpacking.
 //
 //
 // NOTE: This class should only be used on the file thread.
-class SandboxedExtensionUnpacker : public UtilityProcessHost::Client {
+class SandboxedExtensionUnpacker : public content::UtilityProcessHostClient {
  public:
   // The size of the magic character sequence at the beginning of each crx
   // file, in bytes. This should be a multiple of 4.
   static const size_t kExtensionHeaderMagicSize = 4;
 
   // This header is the first data at the beginning of an extension. Its
   // contents are purposely 32-bit aligned so that it can just be slurped into
   // a struct without manual parsing.
   struct ExtensionHeader {
     char magic[kExtensionHeaderMagicSize];
@@ skipping 105 matching lines @@
   // in ExtensionUnpacker as it is not specific to sandboxed unpacking. It was
   // put here because we cannot run windows crypto code in the sandbox. But we
   // could still have this method statically on ExtensionUnpacker so that code
   // just for unpacking is there and code just for sandboxing of unpacking is
   // here.
   bool ValidateSignature();
 
   // Starts the utility process that unpacks our extension.
   void StartProcessOnIOThread(const FilePath& temp_crx_path);
 
-  // UtilityProcessHost::Client
+  // UtilityProcessHostClient
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void OnProcessCrashed(int exit_code) OVERRIDE;
 
   // IPC message handlers.
   void OnUnpackExtensionSucceeded(const base::DictionaryValue& manifest);
   void OnUnpackExtensionFailed(const string16& error_message);
 
   void ReportFailure(FailureReason reason, const string16& message);
   void ReportSuccess(const base::DictionaryValue& original_manifest);
 
@@ skipping 39 matching lines @@
 
   // Location to use for the unpacked extension.
   Extension::Location location_;
 
   // Creation flags to use for the extension.  These flags will be used
   // when calling Extenion::Create() by the crx installer.
   int creation_flags_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SANDBOXED_EXTENSION_UNPACKER_H_