[Refactor] to rename and re-layer the file_util stack layers.

webkit/fileapi/file_system_path_manager.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 "webkit/fileapi/file_system_path_manager.h"
 
 #include "base/rand_util.h"
 #include "base/logging.h"
 #include "base/memory/scoped_callback_factory.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 142 matching lines @@
       }
       break;
     case kFileSystemTypeUnknown:
     default:
       NOTREACHED();
       return false;
   }
   return true;
 }
 
-FileSystemFileUtil* FileSystemPathManager::GetFileSystemFileUtil(
+FileApiFileUtil* FileSystemPathManager::GetFileUtil(
     FileSystemType type) const {
   switch (type) {
     case kFileSystemTypeTemporary:
     case kFileSystemTypePersistent:
-      return sandbox_provider_->GetFileSystemFileUtil();
+      return sandbox_provider_->GetFileUtil();
     case kFileSystemTypeExternal:
       if (external_provider_.get()) {
-        return external_provider_->GetFileSystemFileUtil();
+        return external_provider_->GetFileUtil();
       } else {
         NOTREACHED();
         return NULL;
       }
     case kFileSystemTypeUnknown:
     default:
       NOTREACHED();
       return NULL;
   }
 }
 
 }  // namespace fileapi
 
 COMPILE_ASSERT(int(WebFileSystem::TypeTemporary) == \
                int(fileapi::kFileSystemTypeTemporary), mismatching_enums);
 COMPILE_ASSERT(int(WebFileSystem::TypePersistent) == \
                int(fileapi::kFileSystemTypePersistent), mismatching_enums);
 COMPILE_ASSERT(int(WebFileSystem::TypeExternal) == \
                int(fileapi::kFileSystemTypeExternal), mismatching_enums);