Fix the build break of preferences.cc

chrome/browser/chromeos/preferences.cc

Index: chrome/browser/chromeos/preferences.cc
diff --git a/chrome/browser/chromeos/preferences.cc b/chrome/browser/chromeos/preferences.cc
index 2359c1a189e2035a254e7f8953a0f12448d6a81f..8b8e301e722410d6648d70585f7811bbf845c55c 100644
--- a/chrome/browser/chromeos/preferences.cc
+++ b/chrome/browser/chromeos/preferences.cc
@@ -588,7 +588,8 @@ void Preferences::UpdateVirturalKeyboardPreference(PrefService* prefs) {
       // Either |layout_id| or |url| is invalid. Remove the key from |prefs|
       // later.
       layouts_to_remove.push_back(layout_id);
-      LOG(ERROR) << "Removing invalid virtual keyboard pref: layout=" << layout;
+      LOG(ERROR) << "Removing invalid virtual keyboard pref: layout="
+                 << layout_id;
     }
   }