Debug the generic session restore failure.

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index d509ec9e775e6dabcff3a91a62dfe9e7b46b7161..1e2a82484ceba19288be28bd5470e1970ccd2cb6 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -127,6 +127,8 @@ namespace chrome {
 void RegisterLocalState(PrefService* local_state) {
   // Prefs in Local State
   local_state->RegisterIntegerPref(prefs::kMultipleProfilePrefMigration, 0);
+  local_state->RegisterListPref(prefs::kSessionRestoreFilesCycled,
+                                PrefService::UNSYNCABLE_PREF);
 
   browser_shutdown::RegisterPrefs(local_state);
   ExternalProtocolHandler::RegisterPrefs(local_state);