Remove CloseFile from FileSystem.

chrome/browser/chromeos/drive/async_file_util.cc

Index: chrome/browser/chromeos/drive/async_file_util.cc
diff --git a/chrome/browser/chromeos/drive/async_file_util.cc b/chrome/browser/chromeos/drive/async_file_util.cc
index e385033e960a0744a1e0d8a8d30d9892e9defaf7..3fbdb8ba10f0713ed732e809cfdb04a395310fd9 100644
--- a/chrome/browser/chromeos/drive/async_file_util.cc
+++ b/chrome/browser/chromeos/drive/async_file_util.cc
@@ -50,7 +50,8 @@ void RunCreateOrOpenFileCallback(
     const base::FilePath& file_path,
     const AsyncFileUtil::CreateOrOpenCallback& callback,
     base::PlatformFileError error,
-    base::PlatformFile file) {
+    base::PlatformFile file,
+    const base::Closure& on_close_callback_on_ui_thread) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   // It is necessary to make a closure, which runs on file closing here.
@@ -58,10 +59,9 @@ void RunCreateOrOpenFileCallback(
   // (crbug.com/259184).
   callback.Run(
       error, base::PassPlatformFile(&file),
-      base::Bind(&PostFileSystemCallback,
-                 file_system_getter,
-                 base::Bind(&fileapi_internal::CloseFile, file_path),
-                 base::Closure()));
+      base::Bind(&google_apis::RunTaskOnThread,
+                 BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI),
+                 on_close_callback_on_ui_thread));
 }
 
 // Runs CreateOrOpenFile when the error happens.