Fix the build break of preferences.cc

TBR=yusukes@chromium.org
BUG=none
TEST=Build succeeds

Review URL: http://codereview.chromium.org/7621037

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@97123 0039d316-1c4b-4281-b951-d872f2087c98

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;
     }
   }