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

Source/core/css/CSSGridTemplateAreasValue.cpp

Index: Source/core/css/CSSGridTemplateAreasValue.cpp
diff --git a/Source/core/css/CSSGridTemplateAreasValue.cpp b/Source/core/css/CSSGridTemplateAreasValue.cpp
index 144cea0294c83f215a60be904de909c7e63f8b00..5f527b15663f0ca49f86b4bda35f84610b8a0724 100644
--- a/Source/core/css/CSSGridTemplateAreasValue.cpp
+++ b/Source/core/css/CSSGridTemplateAreasValue.cpp
@@ -49,18 +49,16 @@ static String stringForPosition(const NamedGridAreaMap& gridAreaMap, size_t row,
 {
     Vector<String> candidates;
 
-    NamedGridAreaMap::const_iterator end = gridAreaMap.end();
-    for (NamedGridAreaMap::const_iterator it = gridAreaMap.begin(); it != end; ++it) {
-        const GridCoordinate& coordinate = it->value;
+    for (const auto& item : gridAreaMap) {
+        const GridCoordinate& coordinate = item.value;
         if (row >= coordinate.rows.resolvedInitialPosition.toInt() && row <= coordinate.rows.resolvedFinalPosition.toInt())
-            candidates.append(it->key);
+            candidates.append(item.key);
     }
 
-    end = gridAreaMap.end();
-    for (NamedGridAreaMap::const_iterator it = gridAreaMap.begin(); it != end; ++it) {
-        const GridCoordinate& coordinate = it->value;
-        if (column >= coordinate.columns.resolvedInitialPosition.toInt() && column <= coordinate.columns.resolvedFinalPosition.toInt() && candidates.contains(it->key))
-            return it->key;
+    for (const auto& item : gridAreaMap) {
+        const GridCoordinate& coordinate = item.value;
+        if (column >= coordinate.columns.resolvedInitialPosition.toInt() && column <= coordinate.columns.resolvedFinalPosition.toInt() && candidates.contains(item.key))
+            return item.key;
     }
 
     return ".";