Fix a crash during aborting of operations on provided file systems.

chrome/browser/chromeos/file_system_provider/throttled_file_system.cc

Index: chrome/browser/chromeos/file_system_provider/throttled_file_system.cc
diff --git a/chrome/browser/chromeos/file_system_provider/throttled_file_system.cc b/chrome/browser/chromeos/file_system_provider/throttled_file_system.cc
index 1f41daed3aaa9b413d35adfd28cde3e24105955b..66e3965ffffba9af2ed6d98ea963d013a9510616 100644
--- a/chrome/browser/chromeos/file_system_provider/throttled_file_system.cc
+++ b/chrome/browser/chromeos/file_system_provider/throttled_file_system.cc
@@ -195,7 +195,8 @@ void ThrottledFileSystem::OnOpenFileCompleted(int queue_token,
                                               const OpenFileCallback& callback,
                                               int file_handle,
                                               base::File::Error result) {
-  open_queue_->Complete(queue_token);
+  if (result != base::File::FILE_ERROR_ABORT)
+    open_queue_->Complete(queue_token);
 
   // If the file is opened successfully then hold the queue token until the file
   // is closed.