This reverts the removal of a Flush that is correlated with file corruption.

chrome/browser/sessions/session_backend.cc

Index: chrome/browser/sessions/session_backend.cc
diff --git a/chrome/browser/sessions/session_backend.cc b/chrome/browser/sessions/session_backend.cc
index 8b0d58dc9357f44a7fc428ce88b8d66af0f37199..9492b75bd56c9ca36396fa09bcbf690cc088eb05 100644
--- a/chrome/browser/sessions/session_backend.cc
+++ b/chrome/browser/sessions/session_backend.cc
@@ -337,6 +337,11 @@ bool SessionBackend::AppendCommandsToFile(net::FileStream* file,
         return false;
       }
     }
+#if defined(OS_CHROMEOS)
+    // TODO(gspencer): Remove this once we find a better place to do it.
+    // See issue http://crbug.com/245015
+    file->FlushSync();
+#endif
   }
   return true;
 }