Remove TreatNullAs=NullString for HTMLTextAreaElement

Source/core/html/HTMLTextAreaElement.idl

Index: Source/core/html/HTMLTextAreaElement.idl
diff --git a/Source/core/html/HTMLTextAreaElement.idl b/Source/core/html/HTMLTextAreaElement.idl
index a0bd1006095c607f00d5985e7c2d7d2752854315..2e01c6d037d598d36207f1ebf0dca6e7e14f8e3b 100644
--- a/Source/core/html/HTMLTextAreaElement.idl
+++ b/Source/core/html/HTMLTextAreaElement.idl
@@ -22,20 +22,20 @@
 interface HTMLTextAreaElement : HTMLElement {
     [Reflect] attribute boolean autofocus;
     attribute long cols;
-    [Reflect, TreatNullAs=NullString] attribute DOMString dirName;
+    [Reflect] attribute DOMString dirName;
     [Reflect] attribute boolean disabled;
     readonly attribute HTMLFormElement form;
     [RaisesException=Setter] attribute long maxLength;
-    [Reflect, TreatNullAs=NullString] attribute DOMString name;
-    [Reflect, TreatNullAs=NullString] attribute DOMString placeholder;
+    [Reflect] attribute DOMString name;
+    [Reflect] attribute DOMString placeholder;
     [Reflect] attribute boolean readOnly;
     [Reflect] attribute boolean required;
     attribute long rows;
-    [Reflect, TreatNullAs=NullString] attribute DOMString wrap;
-    [RuntimeEnabled=InputModeAttribute, Reflect, TreatNullAs=NullString] attribute DOMString inputMode;
+    [Reflect] attribute DOMString wrap;
+    [RuntimeEnabled=InputModeAttribute, Reflect] attribute DOMString inputMode;
 
     readonly attribute DOMString type;
-    [TreatNullAs=NullString] attribute DOMString defaultValue;
+    attribute DOMString defaultValue;
     [TreatNullAs=NullString] attribute DOMString value;
     readonly attribute unsigned long textLength;