Remove TreatNullAs=NullString for various HTML elements

LayoutTests/fast/dom/element-attribute-js-null-expected.txt

Index: LayoutTests/fast/dom/element-attribute-js-null-expected.txt
diff --git a/LayoutTests/fast/dom/element-attribute-js-null-expected.txt b/LayoutTests/fast/dom/element-attribute-js-null-expected.txt
index 8b66064eb2f7a97e1a2366654af5f2e840a2851d..504aa6bb7fc5f7801141c322d0bcf1e108b557e2 100644
--- a/LayoutTests/fast/dom/element-attribute-js-null-expected.txt
+++ b/LayoutTests/fast/dom/element-attribute-js-null-expected.txt
@@ -151,10 +151,10 @@ TEST SUCCEEDED: The value was the empty string. [tested HTMLInputElement.useMap]
 TEST SUCCEEDED: The value was the empty string. [tested HTMLInputElement.value]
 
 TEST SUCCEEDED: The value was the empty string. [tested HTMLLabelElement.accessKey]
-TEST SUCCEEDED: The value was the empty string. [tested HTMLLabelElement.htmlFor]
+TEST SUCCEEDED: The value was the string 'null'. [tested HTMLLabelElement.htmlFor]
 
 TEST SUCCEEDED: The value was the empty string. [tested HTMLLegendElement.accessKey]
-TEST SUCCEEDED: The value was the empty string. [tested HTMLLegendElement.align]
+TEST SUCCEEDED: The value was the string 'null'. [tested HTMLLegendElement.align]
 
 TEST SUCCEEDED: The value was the string 'null'. [tested HTMLLIElement.type]
 
@@ -167,7 +167,7 @@ TEST SUCCEEDED: The value was the empty string. [tested HTMLLinkElement.rev]
 TEST SUCCEEDED: The value was the empty string. [tested HTMLLinkElement.target]
 TEST SUCCEEDED: The value was the empty string. [tested HTMLLinkElement.type]
 
-TEST SUCCEEDED: The value was the empty string. [tested HTMLMapElement.name]
+TEST SUCCEEDED: The value was the string 'null'. [tested HTMLMapElement.name]
 
 TEST SUCCEEDED: The value was the empty string. [tested HTMLMetaElement.content]
 TEST SUCCEEDED: The value was the empty string. [tested HTMLMetaElement.httpEquiv]
@@ -193,7 +193,7 @@ TEST SUCCEEDED: The value was the empty string. [tested HTMLObjectElement.width]
 
 TEST SUCCEEDED: The value was the string 'null'. [tested HTMLOListElement.type]
 
-TEST SUCCEEDED: The value was the empty string. [tested HTMLOptGroupElement.label]
+TEST SUCCEEDED: The value was the string 'null'. [tested HTMLOptGroupElement.label]
 
 TEST SUCCEEDED: The value was the string 'null'. [tested HTMLOptionElement.text]
 TEST SUCCEEDED: The value was the string 'null'. [tested HTMLOptionElement.label]
@@ -222,8 +222,8 @@ TEST SUCCEEDED: The value was the string 'null'. [tested HTMLSourceElement.media
 TEST SUCCEEDED: The value was the string 'null' resolved as a URL. [tested HTMLSourceElement.src]
 TEST SUCCEEDED: The value was the string 'null'. [tested HTMLSourceElement.type]
 
-TEST SUCCEEDED: The value was the empty string. [tested HTMLStyleElement.media]
-TEST SUCCEEDED: The value was the empty string. [tested HTMLStyleElement.type]
+TEST SUCCEEDED: The value was the string 'null'. [tested HTMLStyleElement.media]
+TEST SUCCEEDED: The value was the string 'null'. [tested HTMLStyleElement.type]
 
 TEST SUCCEEDED: The value was the empty string. [tested HTMLTableCaptionElement.align]
 
@@ -271,7 +271,7 @@ TEST SUCCEEDED: The value was the empty string. [tested HTMLTextAreaElement.acce
 TEST SUCCEEDED: The value was the empty string. [tested HTMLTextAreaElement.name]
 TEST SUCCEEDED: The value was the empty string. [tested HTMLTextAreaElement.value]
 
-TEST SUCCEEDED: The value was the empty string. [tested HTMLTitleElement.text]
+TEST SUCCEEDED: The value was the string 'null'. [tested HTMLTitleElement.text]
 
 TEST SUCCEEDED: The value was the string 'subtitles'. [tested HTMLTrackElement.kind]
 TEST SUCCEEDED: The value was the string 'null'. [tested HTMLTrackElement.label]