Have HTMLFormElement's named getter return a RadioNodeList.

Source/core/html/HTMLCollection.cpp

Index: Source/core/html/HTMLCollection.cpp
diff --git a/Source/core/html/HTMLCollection.cpp b/Source/core/html/HTMLCollection.cpp
index a0edbbc2f208a1b2285f96ac7171948e3dc2f838..b78c2800dbd1161e593df2c51c7c3f73a4c0dc09 100644
--- a/Source/core/html/HTMLCollection.cpp
+++ b/Source/core/html/HTMLCollection.cpp
@@ -68,6 +68,7 @@ static bool shouldOnlyIncludeDirectChildren(CollectionType type)
     case TagNodeListType:
     case HTMLTagNodeListType:
     case RadioNodeListType:
+    case RadioImgNodeListType:
     case LabelsNodeListType:
         break;
     }
@@ -106,6 +107,7 @@ static NodeListRootType rootTypeFromCollectionType(CollectionType type)
     case TagNodeListType:
     case HTMLTagNodeListType:
     case RadioNodeListType:
+    case RadioImgNodeListType:
     case LabelsNodeListType:
         break;
     }
@@ -150,6 +152,7 @@ static NodeListInvalidationType invalidationTypeExcludingIdAndNameAttributes(Col
     case TagNodeListType:
     case HTMLTagNodeListType:
     case RadioNodeListType:
+    case RadioImgNodeListType:
     case LabelsNodeListType:
         break;
     }
@@ -232,6 +235,7 @@ template <> inline bool isMatchingElement(const HTMLCollection* htmlCollection,
     case TagNodeListType:
     case HTMLTagNodeListType:
     case RadioNodeListType:
+    case RadioImgNodeListType:
     case LabelsNodeListType:
         ASSERT_NOT_REACHED();
     }