[fsp] Add throttling for number of opened files.

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

Index: chrome/browser/chromeos/file_system_provider/fileapi/file_stream_writer.cc
diff --git a/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_writer.cc b/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_writer.cc
index 3290129a4db4dc697982830d48e8b00a2f6fa4f6..35dc72f6c79038fde7936f0985a0d3f3229b031a 100644
--- a/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_writer.cc
+++ b/chrome/browser/chromeos/file_system_provider/fileapi/file_stream_writer.cc
@@ -7,6 +7,7 @@
 #include "base/debug/trace_event.h"
 #include "base/memory/ref_counted.h"
 #include "base/thread_task_runner_handle.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"
@@ -106,10 +107,9 @@ class FileStreamWriter::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));
   }
 
@@ -149,7 +149,7 @@ class FileStreamWriter::OperationRunner
         BrowserThread::IO, FROM_HERE, base::Bind(callback, result));
   }
 
-  ProvidedFileSystemInterface::AbortCallback abort_callback_;
+  AbortCallback abort_callback_;
   base::WeakPtr<ProvidedFileSystemInterface> file_system_;
   int file_handle_;