FileSystemContext::partition_path should not be held as a const ref

webkit/fileapi/file_system_context.h

 // Copyright (c) 2012 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 WEBKIT_FILEAPI_FILE_SYSTEM_CONTEXT_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_CONTEXT_H_
 
 #include <map>
 #include <string>
 
@@ skipping 175 matching lines @@
 
   // Regular mount point providers.
   scoped_ptr<SandboxMountPointProvider> sandbox_provider_;
   scoped_ptr<IsolatedMountPointProvider> isolated_provider_;
   scoped_ptr<ExternalFileSystemMountPointProvider> external_provider_;
 
   // Registered mount point providers.
   std::map<FileSystemType, FileSystemMountPointProvider*> provider_map_;
 
   // The base path of the storage partition for this context.
-  const FilePath& partition_path_;
+  const FilePath partition_path_;
 
   // For syncable file systems.
   scoped_ptr<LocalFileChangeTracker> change_tracker_;
   scoped_refptr<LocalFileSyncContext> sync_context_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(FileSystemContext);
 };
 
 struct DefaultContextDeleter {
   static void Destruct(const FileSystemContext* context) {
     context->DeleteOnCorrectThread();
   }
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_CONTEXT_H_