Unify HasGDocFileExtension and IsHostedDocumentByExtentoin.

chrome/browser/chromeos/drive/file_system/copy_operation.cc

Index: chrome/browser/chromeos/drive/file_system/copy_operation.cc
diff --git a/chrome/browser/chromeos/drive/file_system/copy_operation.cc b/chrome/browser/chromeos/drive/file_system/copy_operation.cc
index 1971bec1c863d9e169be5b78f43e1ca7621a04a0..b46845bcb34c05b356c2a0986d759bedf848d536 100644
--- a/chrome/browser/chromeos/drive/file_system/copy_operation.cc
+++ b/chrome/browser/chromeos/drive/file_system/copy_operation.cc
@@ -234,7 +234,7 @@ FileError PrepareTransferFileFromLocalToRemote(
 
   // Try to parse GDoc File and extract the resource id, if necessary.
   // Failing isn't problem. It'd be handled as a regular file, then.
-  if (util::HasGDocFileExtension(local_src_path))
+  if (util::HasHostedDocumentExtension(local_src_path))
     *gdoc_resource_id = util::ReadResourceIdFromGDocFile(local_src_path);
   return FILE_ERROR_OK;
 }