Refactor: Clear m_axObjectCache when AXObject detaches

Source/modules/accessibility/AXMediaControls.cpp

Index: Source/modules/accessibility/AXMediaControls.cpp
diff --git a/Source/modules/accessibility/AXMediaControls.cpp b/Source/modules/accessibility/AXMediaControls.cpp
index e438682276a2cd8304018912f9707c37a89cedb0..6687115bd433e6019d67b6d648b70b72e6418bd9 100644
--- a/Source/modules/accessibility/AXMediaControls.cpp
+++ b/Source/modules/accessibility/AXMediaControls.cpp
@@ -43,12 +43,12 @@ static inline String queryString(WebLocalizedString::Name name)
     return Locale::defaultLocale().queryString(name);
 }
 
-AccessibilityMediaControl::AccessibilityMediaControl(LayoutObject* layoutObject, AXObjectCacheImpl* axObjectCache)
+AccessibilityMediaControl::AccessibilityMediaControl(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
     : AXLayoutObject(layoutObject, axObjectCache)
 {
 }
 
-PassRefPtr<AXObject> AccessibilityMediaControl::create(LayoutObject* layoutObject, AXObjectCacheImpl* axObjectCache)
+PassRefPtr<AXObject> AccessibilityMediaControl::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
 {
     ASSERT(layoutObject->node());
 
@@ -186,12 +186,12 @@ AccessibilityRole AccessibilityMediaControl::roleValue() const
 //
 // AXMediaControlsContainer
 
-AXMediaControlsContainer::AXMediaControlsContainer(LayoutObject* layoutObject, AXObjectCacheImpl* axObjectCache)
+AXMediaControlsContainer::AXMediaControlsContainer(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
     : AccessibilityMediaControl(layoutObject, axObjectCache)
 {
 }
 
-PassRefPtr<AXObject> AXMediaControlsContainer::create(LayoutObject* layoutObject, AXObjectCacheImpl* axObjectCache)
+PassRefPtr<AXObject> AXMediaControlsContainer::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
 {
     return adoptRef(new AXMediaControlsContainer(layoutObject, axObjectCache));
 }
@@ -221,12 +221,12 @@ static String localizedMediaTimeDescription(float /*time*/)
     return String();
 }
 
-AccessibilityMediaTimeline::AccessibilityMediaTimeline(LayoutObject* layoutObject, AXObjectCacheImpl* axObjectCache)
+AccessibilityMediaTimeline::AccessibilityMediaTimeline(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
     : AXSlider(layoutObject, axObjectCache)
 {
 }
 
-PassRefPtr<AXObject> AccessibilityMediaTimeline::create(LayoutObject* layoutObject, AXObjectCacheImpl* axObjectCache)
+PassRefPtr<AXObject> AccessibilityMediaTimeline::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
 {
     return adoptRef(new AccessibilityMediaTimeline(layoutObject, axObjectCache));
 }
@@ -249,12 +249,12 @@ String AccessibilityMediaTimeline::deprecatedHelpText() const
 //
 // AccessibilityMediaTimeDisplay
 
-AccessibilityMediaTimeDisplay::AccessibilityMediaTimeDisplay(LayoutObject* layoutObject, AXObjectCacheImpl* axObjectCache)
+AccessibilityMediaTimeDisplay::AccessibilityMediaTimeDisplay(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
     : AccessibilityMediaControl(layoutObject, axObjectCache)
 {
 }
 
-PassRefPtr<AXObject> AccessibilityMediaTimeDisplay::create(LayoutObject* layoutObject, AXObjectCacheImpl* axObjectCache)
+PassRefPtr<AXObject> AccessibilityMediaTimeDisplay::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
 {
     return adoptRef(new AccessibilityMediaTimeDisplay(layoutObject, axObjectCache));
 }