Bug 625688 - implement nsAccessible::GetParent() for application accessible, r=fer, a=2.0

accessible/src/base/nsAccessible.h

@@ -251,7 +251,7 @@ public:
   /**
    * Return parent accessible.
    */
-  nsAccessible* GetParent();
+  virtual nsAccessible* GetParent();
 
   /**
    * Return child accessible at the given index.

accessible/src/base/nsApplicationAccessible.cpp

@@ -410,6 +410,12 @@ nsApplicationAccessible::InvalidateChildren()
   // and RemoveChild() method calls.
 }
 
+nsAccessible*
+nsApplicationAccessible::GetParent()
+{
+  return nsnull;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // nsAccessible protected methods
 

accessible/src/base/nsApplicationAccessible.h

@@ -131,6 +131,8 @@ public:
 
   virtual void InvalidateChildren();
 
+  virtual nsAccessible* GetParent();
+
 protected:
 
   // nsAccessible