PrefValueStore incorrectly DCHECK()s when handling change notification for unregistered pref.

chrome/browser/prefs/pref_value_store.cc

Index: chrome/browser/prefs/pref_value_store.cc
diff --git a/chrome/browser/prefs/pref_value_store.cc b/chrome/browser/prefs/pref_value_store.cc
index c86accdb58395edbd2bc1da7118a9f5b178507b6..c16491ef38a9d83a902105d8d156b67a5dda5268 100644
--- a/chrome/browser/prefs/pref_value_store.cc
+++ b/chrome/browser/prefs/pref_value_store.cc
@@ -117,21 +117,10 @@ void PrefValueStore::NotifyPrefChanged(
     PrefValueStore::PrefStoreType new_store) {
   DCHECK(new_store != INVALID_STORE);
 
-  bool changed = true;
-  // Replying that the pref has changed in case the new store is invalid may
-  // cause problems, but it's the safer choice.
-  if (new_store != INVALID_STORE) {
-    PrefStoreType controller = ControllingPrefStoreForPref(path);
-    DCHECK(controller != INVALID_STORE);
-    // If the pref is controlled by a higher-priority store, its effective value
-    // cannot have changed.
-    if (controller != INVALID_STORE &&
-        controller < new_store) {
-      changed = false;
-    }
-  }
-
-  if (changed)
+  // If the pref is controlled by a higher-priority store, its effective value
+  // cannot have changed.
+  PrefStoreType controller = ControllingPrefStoreForPref(path);
+  if (controller == INVALID_STORE || controller >= new_store)
     pref_notifier_->OnPreferenceChanged(path);
 }