This adds a Flush to the session backend to help with data corruption

chrome/browser/sessions/session_backend.cc

 // Copyright (c) 2011 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 323 matching lines @@
     }
     if (content_size > 0) {
       wrote = file->Write(reinterpret_cast<char*>((*i)->contents()),
                           content_size, NULL);
       if (wrote != content_size) {
         NOTREACHED() << "error writing";
         return false;
       }
     }
   }
+  file->Flush();
   return true;
 }
 
 SessionBackend::~SessionBackend() {
 }
 
 void SessionBackend::ResetFile() {
   DCHECK(inited_);
   if (current_session_file_.get()) {
     // File is already open, truncate it. We truncate instead of closing and
@@ skipping 36 matching lines @@
 }
 
 FilePath SessionBackend::GetCurrentSessionPath() {
   FilePath path = path_to_dir_;
   if (type_ == BaseSessionService::TAB_RESTORE)
     path = path.AppendASCII(kCurrentTabSessionFileName);
   else
     path = path.AppendASCII(kCurrentSessionFileName);
   return path;
 }