ole32: Remove the ancestorStorage attribute.

dlls/ole32/storage32.c

@@ -2459,12 +2459,6 @@ static HRESULT StorageImpl_Construct(
   This->base.ref = 1;
   This->base.create = create;
 
-  /*
-   * This is the top-level storage so initialize the ancestor pointer
-   * to this.
-   */
-  This->base.ancestorStorage = This;
-
   This->base.reverted = 0;
 
   This->hFile = hFile;
@@ -3822,12 +3816,10 @@ SmallBlockChainStream* Storage32Impl_BigBlocksToSmallBlocks(
 
 static void StorageInternalImpl_Invalidate( StorageInternalImpl *This )
 {
-  if (This->base.ancestorStorage)
+  if (!This->base.reverted)
   {
     TRACE("Storage invalidated (stg=%p)\n", This);
 
-    This->base.ancestorStorage = NULL;
-
     This->base.reverted = 1;
 
     This->parentStorage = NULL;
@@ -4388,11 +4380,6 @@ static StorageInternalImpl* StorageInternalImpl_Construct(
     newStorage->base.baseVtbl = &StorageInternalImpl_BaseVtbl;
     newStorage->base.openFlags = (openFlags & ~STGM_CREATE);
 
-    /*
-     * Keep the ancestor storage pointer but do not nail a reference to it.
-     */
-    newStorage->base.ancestorStorage = parentStorage->ancestorStorage;
-
     newStorage->base.reverted = 0;
 
     newStorage->parentStorage = parentStorage;

dlls/ole32/storage32.h

@@ -214,11 +214,6 @@ struct StorageBaseImpl
   LONG ref;
 
   /*
-   * Ancestor storage (top level)
-   */
-  StorageImpl* ancestorStorage;
-
-  /*
    * TRUE if this object has been invalidated
    */
   int reverted;