Fix race condition in utility process clients

chrome/browser/importer/external_process_importer_client.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_IMPORTER_EXTERNAL_PROCESS_IMPORTER_CLIENT_H_
 #define CHROME_BROWSER_IMPORTER_EXTERNAL_PROCESS_IMPORTER_CLIENT_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 91 matching lines @@
   // Total number of favicons to import.
   size_t total_favicons_count_;
 
   // Notifications received from the ProfileImportProcessHost are passed back
   // to process_importer_host_, which calls the ProfileWriter to record the
   // import data.  When the import process is done, process_importer_host_
   // deletes itself.
   ExternalProcessImporterHost* process_importer_host_;
 
   // Handles sending messages to the external process.  Deletes itself when
-  // the external process dies (see ChildProcessHost::OnChildDied).
-  UtilityProcessHost* utility_process_host_;
+  // the external process dies (see
+  // BrowserChildProcessHost::OnChildDisconnected).
+  base::WeakPtr<UtilityProcessHost> utility_process_host_;
 
   // Data to be passed from the importer host to the external importer.
   const importer::SourceProfile& source_profile_;
   uint16 items_;
 
   // Takes import data coming over IPC and delivers it to be written by the
   // ProfileWriter.  Released by ExternalProcessImporterClient in its
   // destructor.
   InProcessImporterBridge* bridge_;
 
   // True if import process has been cancelled.
   bool cancelled_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalProcessImporterClient);
 };
 
 #endif  // CHROME_BROWSER_IMPORTER_EXTERNAL_PROCESS_IMPORTER_CLIENT_H_