Use C++11 range-based loop in core/events

Source/core/events/EventListenerMap.cpp

Index: Source/core/events/EventListenerMap.cpp
diff --git a/Source/core/events/EventListenerMap.cpp b/Source/core/events/EventListenerMap.cpp
index e2567ed420582b07d5626a5866fee54f51b69407..8211a8e69e40fccae9867bf0dba1b01d81b974b1 100644
--- a/Source/core/events/EventListenerMap.cpp
+++ b/Source/core/events/EventListenerMap.cpp
@@ -200,11 +200,11 @@ void EventListenerMap::removeFirstEventListenerCreatedFromMarkup(const AtomicStr
 
 static void copyListenersNotCreatedFromMarkupToTarget(const AtomicString& eventType, EventListenerVector* listenerVector, EventTarget* target)
 {
-    for (size_t i = 0; i < listenerVector->size(); ++i) {
+    for (const auto& eventListener : *listenerVector) {
         // Event listeners created from markup have already been transfered to the shadow tree during cloning.
-        if ((*listenerVector)[i].listener->wasCreatedFromMarkup())
+        if (eventListener.listener->wasCreatedFromMarkup())
             continue;
-        target->addEventListener(eventType, (*listenerVector)[i].listener, (*listenerVector)[i].useCapture);
+        target->addEventListener(eventType, eventListener.listener, eventListener.useCapture);
     }
 }
 
@@ -212,19 +212,19 @@ void EventListenerMap::copyEventListenersNotCreatedFromMarkupToTarget(EventTarge
 {
     assertNoActiveIterators();
 
-    for (unsigned i = 0; i < m_entries.size(); ++i)
-        copyListenersNotCreatedFromMarkupToTarget(m_entries[i].first, m_entries[i].second.get(), target);
+    for (const auto& eventListener : m_entries)
+        copyListenersNotCreatedFromMarkupToTarget(eventListener.first, eventListener.second.get(), target);
 }
 
 EventListenerIterator::EventListenerIterator()
-    : m_map(0)
+    : m_map(nullptr)
     , m_entryIndex(0)
     , m_index(0)
 {
 }
 
 EventListenerIterator::EventListenerIterator(EventTarget* target)
-    : m_map(0)
+    : m_map(nullptr)
     , m_entryIndex(0)
     , m_index(0)
 {