[Editing][DOM][CodeHealth] Make Node::hasEditableStyle global functions.

third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp

Index: third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp b/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
index 33a802fb36600ba0a3a9e195d493330c33d30ab3..5b3ea2c4647ec9d2185a2ae54c68b393ba12b969 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.cpp
@@ -494,10 +494,10 @@ bool AXLayoutObject::isReadOnly() const
     if (isWebArea()) {
         Document& document = m_layoutObject->document();
         HTMLElement* body = document.body();
-        if (body && body->hasEditableStyle())
+        if (body && hasEditableStyle(*body))
             return false;
 
-        return !document.hasEditableStyle();
+        return !hasEditableStyle(document);
     }
 
     return AXNodeObject::isReadOnly();