Move WebAXObject.cpp to core/ (WIP)

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

Index: third_party/WebKit/Source/modules/accessibility/AXLayoutObject.h
diff --git a/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.h b/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.h
index 1898ac0c30261b4c466bfac0f7563c47f066527a..44f9df999baab8deb70315cc32c46eea47e73a37 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.h
+++ b/third_party/WebKit/Source/modules/accessibility/AXLayoutObject.h
@@ -118,9 +118,9 @@ class MODULES_EXPORT AXLayoutObject : public AXNodeObject {
   String StringValue() const override;
 
   // ARIA attributes.
-  void AriaDescribedbyElements(AXObjectVector&) const override;
-  void AriaLabelledbyElements(AXObjectVector&) const override;
-  void AriaOwnsElements(AXObjectVector&) const override;
+  void AriaDescribedbyElements(AXObjectImplVector&) const override;
+  void AriaLabelledbyElements(AXObjectImplVector&) const override;
+  void AriaOwnsElements(AXObjectImplVector&) const override;
 
   bool AriaHasPopup() const override;
   bool AriaRoleHasPresentationalChildren() const override;