Introduce HTMLDataListOptionsCollection subclass for HTMLCollection

Source/core/html/forms/ColorInputType.cpp

Index: Source/core/html/forms/ColorInputType.cpp
diff --git a/Source/core/html/forms/ColorInputType.cpp b/Source/core/html/forms/ColorInputType.cpp
index 7c03cd600ef3f9cd618e3c95539db878b6561aa2..1020281ba861c15ab5b4706ac691784a29ee21ba 100644
--- a/Source/core/html/forms/ColorInputType.cpp
+++ b/Source/core/html/forms/ColorInputType.cpp
@@ -38,6 +38,7 @@
 #include "core/events/MouseEvent.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/HTMLDataListElement.h"
+#include "core/html/HTMLDataListOptionsCollection.h"
 #include "core/html/HTMLDivElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLOptionElement.h"
@@ -236,8 +237,8 @@ Vector<ColorSuggestion> ColorInputType::suggestions() const
     Vector<ColorSuggestion> suggestions;
     HTMLDataListElement* dataList = element().dataList();
     if (dataList) {
-        RefPtrWillBeRawPtr<HTMLCollection> options = dataList->options();
-        for (unsigned i = 0; HTMLOptionElement* option = toHTMLOptionElement(options->item(i)); i++) {
+        RefPtrWillBeRawPtr<HTMLDataListOptionsCollection> options = dataList->options();
+        for (unsigned i = 0; HTMLOptionElement* option = options->item(i); i++) {
             if (!element().isValidValue(option->value()))
                 continue;
             Color color;