Rename two functions related to 'default button'

third_party/WebKit/Source/core/html/HTMLFormElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLFormElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLFormElement.cpp b/third_party/WebKit/Source/core/html/HTMLFormElement.cpp
index 978394019ed30490d4b3ac1942c8f025ae5db17c..001143f978f03eb6431ed56afae46f5464e279cc 100644
--- a/third_party/WebKit/Source/core/html/HTMLFormElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLFormElement.cpp
@@ -673,18 +673,16 @@ bool HTMLFormElement::wasUserSubmitted() const
     return m_wasUserSubmitted;
 }
 
-HTMLFormControlElement* HTMLFormElement::defaultButton() const
+HTMLFormControlElement* HTMLFormElement::findDefaultButton() const
 {
-    const FormAssociatedElement::List& elements = associatedElements();
-    for (unsigned i = 0; i < elements.size(); ++i) {
-        if (!elements[i]->isFormControlElement())
+    for (const auto& element : associatedElements()) {
+        if (!element->isFormControlElement())
             continue;
-        HTMLFormControlElement* control = toHTMLFormControlElement(elements[i]);
+        HTMLFormControlElement* control = toHTMLFormControlElement(element);
         if (control->canBeSuccessfulSubmitButton())
             return control;
     }
-
-    return 0;
+    return nullptr;
 }
 
 bool HTMLFormElement::checkValidity()