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

webkit/fileapi/file_system_path_manager.cc

Index: webkit/fileapi/file_system_path_manager.cc
diff --git a/webkit/fileapi/file_system_path_manager.cc b/webkit/fileapi/file_system_path_manager.cc
index 043d649975fe8d1c6f07dd0e2f61649e1baa9f77..5acd35065c6aea8db1e6052ec417ded03dadfeaa 100644
--- a/webkit/fileapi/file_system_path_manager.cc
+++ b/webkit/fileapi/file_system_path_manager.cc
@@ -160,15 +160,15 @@ bool FileSystemPathManager::IsAccessAllowed(
   return true;
 }
 
-FileSystemFileUtil* FileSystemPathManager::GetFileSystemFileUtil(
+FileUtil* 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;