Enable DOM_STORAGE in our build.

chrome/browser/tab_contents/render_view_host_delegate_helper.cc

 // Copyright (c) 2009 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 "render_view_host_delegate_helper.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/character_encoding.h"
 #include "chrome/browser/profile.h"
@@ skipping 158 matching lines @@
         prefs->GetBoolean(prefs::kWebKitJavaEnabled);
     web_prefs.loads_images_automatically =
         !command_line.HasSwitch(switches::kDisableImages) &&
         prefs->GetBoolean(prefs::kWebKitLoadsImagesAutomatically);
     web_prefs.uses_page_cache =
         command_line.HasSwitch(switches::kEnableFastback);
     web_prefs.remote_fonts_enabled =
         command_line.HasSwitch(switches::kEnableRemoteFonts);
     web_prefs.xss_auditor_enabled =
         command_line.HasSwitch(switches::kEnableXSSAuditor);
+    web_prefs.local_storage_enabled =
+      command_line.HasSwitch(switches::kEnableLocalStorage);
+    web_prefs.session_storage_enabled =
+      command_line.HasSwitch(switches::kEnableSessionStorage);
   }
 
   web_prefs.uses_universal_detector =
       prefs->GetBoolean(prefs::kWebKitUsesUniversalDetector);
   web_prefs.text_areas_are_resizable =
       prefs->GetBoolean(prefs::kWebKitTextAreasAreResizable);
 
   // User CSS is currently disabled because it crashes chrome.  See
   // webkit/glue/webpreferences.h for more details.
 
   // Make sure we will set the default_encoding with canonical encoding name.
   web_prefs.default_encoding =
       CharacterEncoding::GetCanonicalEncodingNameByAliasName(
           web_prefs.default_encoding);
   if (web_prefs.default_encoding.empty()) {
     prefs->ClearPref(prefs::kDefaultCharset);
     web_prefs.default_encoding = prefs->GetString(
         prefs::kDefaultCharset);
   }
   DCHECK(!web_prefs.default_encoding.empty());
 
   if (is_dom_ui) {
     web_prefs.loads_images_automatically = true;
     web_prefs.javascript_enabled = true;
   }
 
   return web_prefs;
 }