Revert of "Implement the inert attribute"

third_party/WebKit/Source/modules/accessibility/AXObjectImpl.h

Index: third_party/WebKit/Source/modules/accessibility/AXObjectImpl.h
diff --git a/third_party/WebKit/Source/modules/accessibility/AXObjectImpl.h b/third_party/WebKit/Source/modules/accessibility/AXObjectImpl.h
index f94ffcb98b34e2d46ba400481662a1ac74ba5c09..cd91e85c912574097ef9be485d0da746e7c51447 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXObjectImpl.h
+++ b/third_party/WebKit/Source/modules/accessibility/AXObjectImpl.h
@@ -144,12 +144,11 @@ enum AXIgnoredReason {
   kAXActiveModalDialog,
   kAXAncestorDisallowsChild,
   kAXAncestorIsLeafNode,
-  kAXAriaHiddenElement,
-  kAXAriaHiddenSubtree,
+  kAXAriaHidden,
+  kAXAriaHiddenRoot,
   kAXEmptyAlt,
   kAXEmptyText,
-  kAXInertElement,
-  kAXInertSubtree,
+  kAXInert,
   kAXInheritsPresentation,
   kAXLabelContainer,
   kAXLabelFor,
@@ -466,7 +465,7 @@ class MODULES_EXPORT AXObjectImpl
   virtual bool CanSetSelectedAttribute() const { return false; }
 
   // Whether objects are ignored, i.e. not included in the tree.
-  bool AccessibilityIsIgnored();
+  bool AccessibilityIsIgnored() const;
   typedef HeapVector<IgnoredReason> IgnoredReasons;
   virtual bool ComputeAccessibilityIsIgnored(IgnoredReasons* = nullptr) const {
     return true;
@@ -857,8 +856,6 @@ class MODULES_EXPORT AXObjectImpl
     return nullptr;
   }
 
-  const AXObjectImpl* InertRoot() const;
-
   mutable Member<AXObjectImpl> parent_;
 
   // The following cached attribute values (the ones starting with m_cached*)