NTP: Allow hiding tips and bookmark sync....

chrome/browser/dom_ui/shown_sections_handler.cc

Index: chrome/browser/dom_ui/shown_sections_handler.cc
===================================================================
--- chrome/browser/dom_ui/shown_sections_handler.cc	(revision 30053)
+++ chrome/browser/dom_ui/shown_sections_handler.cc	(working copy)
@@ -47,6 +47,18 @@
 // static
 void ShownSectionsHandler::RegisterUserPrefs(PrefService* prefs) {
   prefs->RegisterIntegerPref(prefs::kNTPShownSections,
-      THUMB | RECENT | TIPS);
+      THUMB | RECENT | TIPS | SYNC);
 }
 
+// static
+void ShownSectionsHandler::MigrateUserPrefs(PrefService* prefs,
+                                            int old_pref_version,
+                                            int new_pref_version) {
+  if (old_pref_version < 1) {
+    int shown_sections = prefs->GetInteger(prefs::kNTPShownSections);
+    // TIPS was used in early builds of the NNTP but since it was removed before
+    // Chrome 3.0 we want to ensure that it is shown by default.
+    shown_sections |= TIPS | SYNC;
+    prefs->SetInteger(prefs::kNTPShownSections, shown_sections);
+  }
+}