Create an API around UtilityProcessHost and use that from chrome.

chrome/browser/extensions/sandboxed_extension_unpacker.cc

 // 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.
 
 #include "chrome/browser/extensions/sandboxed_extension_unpacker.h"
 
 #include <set>
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/file_util_proxy.h"
 #include "base/json/json_value_serializer.h"
 #include "base/memory/scoped_handle.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
 #include "base/utf_string_conversions.h"  // TODO(viettrungluu): delete me.
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_utility_messages.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_file_util.h"
 #include "chrome/common/extensions/extension_l10n_util.h"
 #include "chrome/common/extensions/extension_unpacker.h"
 #include "content/browser/renderer_host/resource_dispatcher_host.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/utility_process_host.h"
 #include "crypto/signature_verifier.h"
 #include "grit/generated_resources.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/codec/png_codec.h"
 
 using content::BrowserThread;
+using content::UtilityProcessHost;
 
 // The following macro makes histograms that record the length of paths
 // in this file much easier to read.
 // Windows has a short max path length. If the path length to a
 // file being unpacked from a CRX exceeds the max length, we might
 // fail to install. To see if this is happening, see how long the
 // path to the temp unpack directory is. See crbug.com/69693 .
 #define PATH_LENGTH_HISTOGRAM(name, path) \
     UMA_HISTOGRAM_CUSTOM_COUNTS(name, path.value().length(), 0, 500, 100)
 
@@ skipping 258 matching lines @@
   // Utility process crashed while trying to install.
   ReportFailure(
      UTILITY_PROCESS_CRASHED_WHILE_TRYING_TO_INSTALL,
      l10n_util::GetStringFUTF16(
          IDS_EXTENSION_PACKAGE_INSTALL_ERROR,
          ASCIIToUTF16("UTILITY_PROCESS_CRASHED_WHILE_TRYING_TO_INSTALL")));
 }
 
 void SandboxedExtensionUnpacker::StartProcessOnIOThread(
     const FilePath& temp_crx_path) {
-  UtilityProcessHost* host = new UtilityProcessHost(this, thread_identifier_);
+  UtilityProcessHost* host = UtilityProcessHost::Create(
+      this, thread_identifier_);
   // Grant the subprocess access to the entire subdir the extension file is
   // in, so that it can unpack to that dir.
-  host->set_exposed_dir(temp_crx_path.DirName());
+  host->SetExposedDir(temp_crx_path.DirName());
   host->Send(
       new ChromeUtilityMsg_UnpackExtension(
           temp_crx_path, location_, creation_flags_));
 }
 
 void SandboxedExtensionUnpacker::OnUnpackExtensionSucceeded(
     const DictionaryValue& manifest) {
   // Skip check for unittests.
   if (thread_identifier_ != BrowserThread::ID_COUNT)
     CHECK(BrowserThread::CurrentlyOn(thread_identifier_));
@@ skipping 440 matching lines @@
           ERROR_SAVING_CATALOG,
           l10n_util::GetStringFUTF16(
               IDS_EXTENSION_PACKAGE_INSTALL_ERROR,
               ASCIIToUTF16("ERROR_SAVING_CATALOG")));
       return false;
     }
   }
 
   return true;
 }