[fsp] Add throttling for number of opened files.

chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.cc

Index: chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.cc
diff --git a/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.cc b/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.cc
index b8f13321432694f833a5e30a425c3e5733e6909a..c0fd8f3926926503e3b5bb85b5ba44eade14216f 100644
--- a/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.cc
+++ b/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_reader.cc
@@ -7,6 +7,7 @@
 #include "base/debug/trace_event.h"
 #include "base/files/file.h"
 #include "base/memory/ref_counted.h"
+#include "chrome/browser/chromeos/file_system_provider/abort_callback.h"
 #include "chrome/browser/chromeos/file_system_provider/fileapi/provider_async_file_util.h"
 #include "chrome/browser/chromeos/file_system_provider/mount_path_util.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h"
@@ -141,10 +142,9 @@ class FileStreamReader::OperationRunner
       return;
     }
 
-    const ProvidedFileSystemInterface::AbortCallback abort_callback =
-        abort_callback_;
-    abort_callback_ = ProvidedFileSystemInterface::AbortCallback();
-    abort_callback.Run(base::Bind(
+    const AbortCallback last_abort_callback = abort_callback_;
+    abort_callback_ = AbortCallback();
+    last_abort_callback.Run(base::Bind(
         &OperationRunner::OnAbortCompletedOnUIThread, this, callback));
   }
 
@@ -201,7 +201,7 @@ class FileStreamReader::OperationRunner
         BrowserThread::IO, FROM_HERE, base::Bind(callback, result));
   }
 
-  ProvidedFileSystemInterface::AbortCallback abort_callback_;
+  AbortCallback abort_callback_;
   base::WeakPtr<ProvidedFileSystemInterface> file_system_;
   base::FilePath file_path_;
   int file_handle_;