Use C++11 range-based loop for core/css

Source/core/css/MediaQueryList.cpp

Index: Source/core/css/MediaQueryList.cpp
diff --git a/Source/core/css/MediaQueryList.cpp b/Source/core/css/MediaQueryList.cpp
index 1e061407a6779fb39453e46853458524b22ae446..e2b3d0a0a7939d7522f8350de411d562554f64fa 100644
--- a/Source/core/css/MediaQueryList.cpp
+++ b/Source/core/css/MediaQueryList.cpp
@@ -103,8 +103,8 @@ bool MediaQueryList::mediaFeaturesChanged(WillBeHeapVector<RefPtrWillBeMember<Me
     m_matchesDirty = true;
     if (!updateMatches())
         return false;
-    for (ListenerList::const_iterator it = m_listeners.begin(), end = m_listeners.end(); it != end; ++it) {
-        listenersToNotify->append(*it);
+    for (const auto& listener : m_listeners) {
+        listenersToNotify->append(listener);
     }
     return hasEventListeners(EventTypeNames::change);
 }