[FileAPI] Remove Flush() on write completion on SandboxFileSystems

content/browser/fileapi/file_writer_delegate_unittest.cc

Index: content/browser/fileapi/file_writer_delegate_unittest.cc
diff --git a/content/browser/fileapi/file_writer_delegate_unittest.cc b/content/browser/fileapi/file_writer_delegate_unittest.cc
index 9f1e22d0f831869c22ba0b228d10eb78fabaadb1..3d2814cc6ca4bccdbf534ea9ba923ebb7cefc806 100644
--- a/content/browser/fileapi/file_writer_delegate_unittest.cc
+++ b/content/browser/fileapi/file_writer_delegate_unittest.cc
@@ -121,7 +121,8 @@ class FileWriterDelegateTest : public PlatformTest {
             *file_system_context_->GetUpdateObservers(kFileSystemType));
     writer->set_default_quota(allowed_growth);
     return new FileWriterDelegate(
-        scoped_ptr<fileapi::FileStreamWriter>(writer));
+        scoped_ptr<fileapi::FileStreamWriter>(writer),
+        FileWriterDelegate::FLUSH_ON_COMPLETION);
   }
 
   FileWriterDelegate::DelegateWriteCallback GetWriteCallback(Result* result) {