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

Source/core/css/SelectorChecker.h

Index: Source/core/css/SelectorChecker.h
diff --git a/Source/core/css/SelectorChecker.h b/Source/core/css/SelectorChecker.h
index 269e8ae4264d3509f54077255379b0fe17181013..650215314ae42e09d1dda447499eec067e97ebd7 100644
--- a/Source/core/css/SelectorChecker.h
+++ b/Source/core/css/SelectorChecker.h
@@ -167,10 +167,8 @@ inline bool SelectorChecker::tagMatches(const Element& element, const QualifiedN
 
 inline bool SelectorChecker::checkExactAttribute(const Element& element, const QualifiedName& selectorAttributeName, const StringImpl* value)
 {
-    AttributeCollection attributes = element.attributesWithoutUpdate();
-    AttributeCollection::iterator end = attributes.end();
-    for (AttributeCollection::iterator it = attributes.begin(); it != end; ++it) {
-        if (it->matches(selectorAttributeName) && (!value || it->value().impl() == value))
+    for (const auto& attribute : element.attributesWithoutUpdate()) {
+        if (attribute.matches(selectorAttributeName) && (!value || attribute.value().impl() == value))
             return true;
     }
     return false;