Add Now setting and migration logic.

chrome/browser/profiles/profile.cc

Index: chrome/browser/profiles/profile.cc
diff --git a/chrome/browser/profiles/profile.cc b/chrome/browser/profiles/profile.cc
index 7292b30cd3f5bb9673de72062d66db53c33aa14a..efa31093cfdec8b01e95e912f59d49b418d53bda 100644
--- a/chrome/browser/profiles/profile.cc
+++ b/chrome/browser/profiles/profile.cc
@@ -113,6 +113,13 @@ void Profile::RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
       false,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 #endif
+  // This pref is intentionally outside the above #if. That flag corresponds
+  // to the Notifier extension and does not gate the launcher page.
+  // TODO(skare): Remove or rename ENABLE_GOOGLE_NOW: http://crbug.com/459827.
+  registry->RegisterBooleanPref(
+      prefs::kGoogleNowLauncherEnabled,
+      true,
+      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterBooleanPref(
       prefs::kDisableExtensions,
       false,