[fsp] Simplify aborting logic.

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 de4f37f8223b3bedeba8ba5b70c30e14d65c2f30..23cde3c2ea545787820f0033e82470c4476b9c9a 100644
--- a/chrome/browser/chromeos/file_system_provider/throttled_file_system.cc
+++ b/chrome/browser/chromeos/file_system_provider/throttled_file_system.cc
@@ -57,7 +57,7 @@ AbortCallback ThrottledFileSystem::OpenFile(const base::FilePath& file_path,
                                             OpenFileMode mode,
                                             const OpenFileCallback& callback) {
   const size_t task_token = open_queue_->NewToken();
-  return open_queue_->Enqueue(
+  open_queue_->Enqueue(
       task_token,
       base::Bind(
           &ProvidedFileSystemInterface::OpenFile,
@@ -65,6 +65,8 @@ AbortCallback ThrottledFileSystem::OpenFile(const base::FilePath& file_path,
           file_path, mode,
           base::Bind(&ThrottledFileSystem::OnOpenFileCompleted,
                      weak_ptr_factory_.GetWeakPtr(), task_token, callback)));
+  return base::Bind(&ThrottledFileSystem::Abort, weak_ptr_factory_.GetWeakPtr(),
+                    task_token);
 }
 
 AbortCallback ThrottledFileSystem::CloseFile(
@@ -181,6 +183,10 @@ base::WeakPtr<ProvidedFileSystemInterface> ThrottledFileSystem::GetWeakPtr() {
   return weak_ptr_factory_.GetWeakPtr();
 }
 
+void ThrottledFileSystem::Abort(int queue_token) {
+  open_queue_->Abort(queue_token);
+}
+
 void ThrottledFileSystem::OnOpenFileCompleted(int queue_token,
                                               const OpenFileCallback& callback,
                                               int file_handle,