Revert of "Implement the inert attribute"

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 db84b535aad4cf89251dfb82132b662592ebe519..3bd0fcebdaf9fa947be938da13641d7e4e46ac59 100644
--- a/third_party/WebKit/Source/core/dom/Node.h
+++ b/third_party/WebKit/Source/core/dom/Node.h
@@ -552,11 +552,8 @@ class CORE_EXPORT Node : public EventTarget {
   // This is called only when the node is focused.
   virtual bool ShouldHaveFocusAppearance() const;
 
-  // Whether the node is inert:
-  // https://html.spec.whatwg.org/multipage/interaction.html#inert
-  // https://github.com/WICG/inert/blob/master/README.md
-  // This can't be in Element because text nodes must be recognized as
-  // inert to prevent text selection.
+  // Whether the node is inert. This can't be in Element because text nodes
+  // must be recognized as inert to prevent text selection.
   bool IsInert() const;
 
   virtual LayoutRect BoundingBox() const;