Enable storing and restoring sessionStorage by default.

chrome/browser/profiles/profile_impl.cc

Index: chrome/browser/profiles/profile_impl.cc
diff --git a/chrome/browser/profiles/profile_impl.cc b/chrome/browser/profiles/profile_impl.cc
index d5144b2f038c9fb3e23102ad778aa0910b09724b..259a4e0d336313865bc4deefe8ba63f3ea4aac7f 100644
--- a/chrome/browser/profiles/profile_impl.cc
+++ b/chrome/browser/profiles/profile_impl.cc
@@ -422,8 +422,8 @@ void ProfileImpl::DoFinalInit(bool is_new_profile) {
         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();
   }