Replace [TreatNullAs=functionName] with [StrictTypeChecking]

Source/core/html/HTMLSelectElement.cpp

Index: Source/core/html/HTMLSelectElement.cpp
diff --git a/Source/core/html/HTMLSelectElement.cpp b/Source/core/html/HTMLSelectElement.cpp
index 8d64f496438ed7d3eb8f4fafae624f2866c00fc3..74f8627def91049db2f6f5c8ff788e38b50bd5f5 100644
--- a/Source/core/html/HTMLSelectElement.cpp
+++ b/Source/core/html/HTMLSelectElement.cpp
@@ -1550,20 +1550,14 @@ void HTMLSelectElement::finishParsingChildren()
 
 bool HTMLSelectElement::anonymousIndexedSetter(unsigned index, PassRefPtr<HTMLOptionElement> value, ExceptionState& exceptionState)
 {
-    if (!value) {
-        exceptionState.throwTypeError(ExceptionMessages::failedToSet(String::number(index), "HTMLSelectElement", "The value provided was not an HTMLOptionElement."));
-        return false;
+    if (!value) { // undefined or null
+        remove(index);
+        return true;
     }
     setOption(index, value.get(), exceptionState);
     return true;
 }
 
-bool HTMLSelectElement::anonymousIndexedSetterRemove(unsigned index, ExceptionState& exceptionState)
-{
-    remove(index);
-    return true;
-}
-
 bool HTMLSelectElement::isInteractiveContent() const
 {
     return true;