One AXObjectCache per frame

Source/modules/accessibility/AXObject.h

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 33 matching lines @@
 class AXObject;
 class AXObjectCache;
 class AXObjectCacheImpl;
 class Element;
 class FrameView;
 class IntPoint;
 class NameSource;
 class Node;
 class LayoutObject;
 class ScrollableArea;
-class Widget;
 
 typedef unsigned AXID;
 
 enum AccessibilityRole {
     UnknownRole = 0,
     AlertDialogRole,
     AlertRole,
     AnnotationRole, // No mapping to ARIA role
     ApplicationRole,
     ArticleRole,
@@ skipping 732 matching lines @@
     virtual double estimatedLoadingProgress() const { return 0; }
     AXObject* focusedUIElement() const;
 
     // DOM and layout tree access.
     virtual Node* node() const { return 0; }
     virtual LayoutObject* layoutObject() const { return 0; }
     virtual Document* document() const;
     virtual FrameView* documentFrameView() const;
     virtual Element* anchorElement() const { return 0; }
     virtual Element* actionElement() const { return 0; }
-    virtual Widget* widgetForAttachmentView() const { return 0; }
     String language() const;
     bool hasAttribute(const QualifiedName&) const;
     const AtomicString& getAttribute(const QualifiedName&) const;
 
     // Methods that retrieve or manipulate the current selection.
 
     // Get the current selection from anywhere in the accessibility tree.
     virtual AXRange selection() const { return AXRange(); }
     // Gets only the start and end offsets of the selection computed using the
     // current object as the starting point. Returns a null selection if there is
@@ skipping 101 matching lines @@
 
 #define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, AXObject, object, object->predicate, object.predicate)
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::IgnoredReason);
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::NameSource);
 
 #endif // AXObject_h