Enable storing and restoring sessionStorage by default.

chrome/browser/profiles/profile_impl.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/profiles/profile_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/environment.h"
@@ skipping 404 matching lines @@
   ChromePluginServiceFilter::GetInstance()->RegisterResourceContext(
       PluginPrefs::GetForProfile(this),
       io_data_.GetResourceContextNoInit());
 
   // Delay README creation to not impact startup performance.
   BrowserThread::PostDelayedTask(
         BrowserThread::FILE, FROM_HERE,
         base::Bind(&EnsureReadmeFile, GetPath()),
         base::TimeDelta::FromMilliseconds(create_readme_delay_ms));
 
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableRestoreSessionState)) {
+  if (!CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDisableRestoreSessionState)) {
     content::BrowserContext::GetDefaultDOMStorageContext(this)->
         SetSaveSessionStorageOnDisk();
   }
 
   // Creation has been finished.
   if (delegate_)
     delegate_->OnProfileCreated(this, true, is_new_profile);
 
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_PROFILE_CREATED,
@@ skipping 638 matching lines @@
   if (!path.empty())
     *cache_path = path;
   *max_size = is_media_context ? prefs_->GetInteger(prefs::kMediaCacheSize) :
                                  prefs_->GetInteger(prefs::kDiskCacheSize);
 }
 
 base::Callback<ChromeURLDataManagerBackend*(void)>
     ProfileImpl::GetChromeURLDataManagerBackendGetter() const {
   return io_data_.GetChromeURLDataManagerBackendGetter();
 }