Make sure getAttribute() / setAttribute() callers use AtomicStrings

Source/core/html/HTMLFormControlElement.cpp

Index: Source/core/html/HTMLFormControlElement.cpp
diff --git a/Source/core/html/HTMLFormControlElement.cpp b/Source/core/html/HTMLFormControlElement.cpp
index b97be4599e7ba40b4713fed9e80735104d7b1651..4e361a6f200ddd4689c69973003bc5fa8437299f 100644
--- a/Source/core/html/HTMLFormControlElement.cpp
+++ b/Source/core/html/HTMLFormControlElement.cpp
@@ -78,7 +78,7 @@ String HTMLFormControlElement::formEnctype() const
     return FormSubmission::Attributes::parseEncodingType(formEnctypeAttr);
 }
 
-void HTMLFormControlElement::setFormEnctype(const String& value)
+void HTMLFormControlElement::setFormEnctype(const AtomicString& value)
 {
     setAttribute(formenctypeAttr, value);
 }
@@ -91,7 +91,7 @@ String HTMLFormControlElement::formMethod() const
     return FormSubmission::Attributes::methodString(FormSubmission::Attributes::parseMethodType(formMethodAttr));
 }
 
-void HTMLFormControlElement::setFormMethod(const String& value)
+void HTMLFormControlElement::setFormMethod(const AtomicString& value)
 {
     setAttribute(formmethodAttr, value);
 }