Clean up accessibility enums for use in Chromium.

Source/core/accessibility/AccessibilityNodeObject.cpp

Index: Source/core/accessibility/AccessibilityNodeObject.cpp
diff --git a/Source/core/accessibility/AccessibilityNodeObject.cpp b/Source/core/accessibility/AccessibilityNodeObject.cpp
index a459ffa417681b718eeb042d41822dc099b35b9f..399ddddc82d8dd55b24bc8275b4d7892ba412123 100644
--- a/Source/core/accessibility/AccessibilityNodeObject.cpp
+++ b/Source/core/accessibility/AccessibilityNodeObject.cpp
@@ -175,7 +175,7 @@ AccessibilityRole AccessibilityNodeObject::determineAccessibilityRole()
         return ariaRole;
 
     if (node()->isLink())
-        return WebCoreLinkRole;
+        return LinkRole;
     if (node()->isTextNode())
         return StaticTextRole;
     if (node()->hasTagName(buttonTag))
@@ -214,7 +214,7 @@ AccessibilityRole AccessibilityNodeObject::determineAccessibilityRole()
     if (node()->isElementNode() && toElement(node())->isFocusable())
         return GroupRole;
     if (node()->hasTagName(aTag) && isClickable())
-        return WebCoreLinkRole;
+        return LinkRole;
 
     return UnknownRole;
 }
@@ -513,7 +513,7 @@ bool AccessibilityNodeObject::isInputImage() const
 
 bool AccessibilityNodeObject::isLink() const
 {
-    return roleValue() == WebCoreLinkRole;
+    return roleValue() == LinkRole;
 }
 
 bool AccessibilityNodeObject::isMenu() const