[Editing][DOM][CodeHealth] Make Node::isContentEditable and Node::isRichEditable global functions.

third_party/WebKit/Source/core/dom/Node.h

Index: third_party/WebKit/Source/core/dom/Node.h
diff --git a/third_party/WebKit/Source/core/dom/Node.h b/third_party/WebKit/Source/core/dom/Node.h
index ad8cbb44bc25ed3e16ec6a51c36b4e1fb368847f..35e6d020c6d8e0bb42544b4a4912d953bafc8809 100644
--- a/third_party/WebKit/Source/core/dom/Node.h
+++ b/third_party/WebKit/Source/core/dom/Node.h
@@ -431,9 +431,9 @@ public:
     {
         switch (editableType) {
         case ContentIsEditable:
-            return hasEditableStyle(Editable, treatment);
+            return hasEditableStyle(this, Editable, treatment);
         case HasEditableAXRole:
-            return isEditableToAccessibility(Editable);
+            return isEditableToAccessibility(this, Editable);
         }
         ASSERT_NOT_REACHED();
         return false;
@@ -443,9 +443,9 @@ public:
     {
         switch (editableType) {
         case ContentIsEditable:
-            return hasEditableStyle(RichlyEditable, UserSelectAllIsAlwaysNonEditable);
+            return hasEditableStyle(this, RichlyEditable, UserSelectAllIsAlwaysNonEditable);
         case HasEditableAXRole:
-            return isEditableToAccessibility(RichlyEditable);
+            return isEditableToAccessibility(this, RichlyEditable);
         }
         ASSERT_NOT_REACHED();
         return false;
@@ -804,9 +804,10 @@ private:
 
     void checkSlotChange();
 
+    // TODO(yoichio): Move these to core/editing
     enum EditableLevel { Editable, RichlyEditable };
-    bool hasEditableStyle(EditableLevel, UserSelectAllTreatment = UserSelectAllIsAlwaysNonEditable) const;
-    bool isEditableToAccessibility(EditableLevel) const;
+    static bool hasEditableStyle(const Node*, EditableLevel, UserSelectAllTreatment = UserSelectAllIsAlwaysNonEditable);
+    static bool isEditableToAccessibility(const Node*, EditableLevel);
 
     bool isUserActionElementActive() const;
     bool isUserActionElementInActiveChain() const;