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

chrome/browser/sessions/session_backend.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/sessions/session_backend.h"
 
 #include <limits>
 
 #include "base/file_util.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 319 matching lines @@
       return false;
     }
     if (content_size > 0) {
       wrote = file->WriteSync(reinterpret_cast<char*>((*i)->contents()),
                               content_size);
       if (wrote != content_size) {
         NOTREACHED() << "error writing";
         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;
 }
 
 SessionBackend::~SessionBackend() {
   if (current_session_file_.get()) {
     // Destructor performs file IO because file is open in sync mode.
     // crbug.com/112512.
     base::ThreadRestrictions::ScopedAllowIO allow_io;
     current_session_file_.reset();
@@ skipping 44 matching lines @@
 }
 
 base::FilePath SessionBackend::GetCurrentSessionPath() {
   base::FilePath path = path_to_dir_;
   if (type_ == BaseSessionService::TAB_RESTORE)
     path = path.AppendASCII(kCurrentTabSessionFileName);
   else
     path = path.AppendASCII(kCurrentSessionFileName);
   return path;
 }