Refactor: Clear m_axObjectCache when AXObject detaches

Source/modules/accessibility/AXSpinButton.cpp

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 13 matching lines @@
  */
 
 #include "config.h"
 #include "modules/accessibility/AXSpinButton.h"
 
 #include "core/layout/LayoutObject.h"
 #include "modules/accessibility/AXObjectCacheImpl.h"
 
 namespace blink {
 
-PassRefPtr<AXSpinButton> AXSpinButton::create(AXObjectCacheImpl* axObjectCache)
+PassRefPtr<AXSpinButton> AXSpinButton::create(AXObjectCacheImpl& axObjectCache)
 {
     return adoptRef(new AXSpinButton(axObjectCache));
 }
 
-AXSpinButton::AXSpinButton(AXObjectCacheImpl* axObjectCache)
+AXSpinButton::AXSpinButton(AXObjectCacheImpl& axObjectCache)
     : AXMockObject(axObjectCache)
     , m_spinButtonElement(0)
 {
 }
 
 AXSpinButton::~AXSpinButton()
 {
 }
 
 LayoutRect AXSpinButton::elementRect() const
@@ skipping 18 matching lines @@
 
 AccessibilityRole AXSpinButton::roleValue() const
 {
     return m_spinButtonElement ? SpinButtonRole : UnknownRole;
 }
 
 void AXSpinButton::addChildren()
 {
     m_haveChildren = true;
 
-    AXSpinButtonPart* incrementor = toAXSpinButtonPart(axObjectCache()->getOrCreate(SpinButtonPartRole));
+    AXSpinButtonPart* incrementor = toAXSpinButtonPart(axObjectCache().getOrCreate(SpinButtonPartRole));
     incrementor->setIsIncrementor(true);
     incrementor->setParent(this);
     m_children.append(incrementor);
 
-    AXSpinButtonPart* decrementor = toAXSpinButtonPart(axObjectCache()->getOrCreate(SpinButtonPartRole));
+    AXSpinButtonPart* decrementor = toAXSpinButtonPart(axObjectCache().getOrCreate(SpinButtonPartRole));
     decrementor->setIsIncrementor(false);
     decrementor->setParent(this);
     m_children.append(decrementor);
 }
 
 void AXSpinButton::step(int amount)
 {
     ASSERT(m_spinButtonElement);
     if (!m_spinButtonElement)
         return;
 
     m_spinButtonElement->step(amount);
 }
 
 // AXSpinButtonPart
 
-AXSpinButtonPart::AXSpinButtonPart(AXObjectCacheImpl* axObjectCache)
+AXSpinButtonPart::AXSpinButtonPart(AXObjectCacheImpl& axObjectCache)
     : AXMockObject(axObjectCache)
     , m_isIncrementor(false)
 {
 }
 
-PassRefPtr<AXSpinButtonPart> AXSpinButtonPart::create(AXObjectCacheImpl* axObjectCache)
+PassRefPtr<AXSpinButtonPart> AXSpinButtonPart::create(AXObjectCacheImpl& axObjectCache)
 {
     return adoptRef(new AXSpinButtonPart(axObjectCache));
 }
 
 LayoutRect AXSpinButtonPart::elementRect() const
 {
     // FIXME: This logic should exist in the layout tree or elsewhere, but there is no
     // relationship that exists that can be queried.
 
     LayoutRect parentRect = parentObject()->elementRect();
@@ skipping 15 matching lines @@
     AXSpinButton* spinButton = toAXSpinButton(parentObject());
     if (m_isIncrementor)
         spinButton->step(1);
     else
         spinButton->step(-1);
 
     return true;
 }
 
 } // namespace blink