mshtml: Get rid of no longer needed HTMLOuterWindow doc_obj pointer.

dlls/mshtml/htmldoc.c

@@ -5321,10 +5321,8 @@ static ULONG WINAPI HTMLDocumentObj_Release(IUnknown *iface)
             This->basedoc.doc_node->basedoc.doc_obj = NULL;
             htmldoc_release(&This->basedoc.doc_node->basedoc);
         }
-        if(This->basedoc.window) {
-            This->basedoc.window->doc_obj = NULL;
+        if(This->basedoc.window)
             IHTMLWindow2_Release(&This->basedoc.window->base.IHTMLWindow2_iface);
-        }
         if(This->advise_holder)
             IOleAdviseHolder_Release(This->advise_holder);
 
@@ -5498,8 +5496,6 @@ static HRESULT create_document_object(BOOL is_mhtml, IUnknown *outer, REFIID rii
     doc->basedoc.window = doc->nscontainer->content_window;
     IHTMLWindow2_AddRef(&doc->basedoc.window->base.IHTMLWindow2_iface);
 
-    doc->basedoc.window->doc_obj = doc;
-
     if(!doc->basedoc.doc_node && doc->basedoc.window->base.inner_window->doc) {
         doc->basedoc.doc_node = doc->basedoc.window->base.inner_window->doc;
         htmldoc_addref(&doc->basedoc.doc_node->basedoc);

dlls/mshtml/htmlwindow.c

@@ -3567,8 +3567,6 @@ HRESULT create_outer_window(GeckoBrowser *browser, mozIDOMWindowProxy *mozwindow
 
     window->base.outer_window = window;
     window->base.inner_window = NULL;
-
-    window->doc_obj = browser->doc;
     window->browser = browser;
     list_add_head(&browser->outer_windows, &window->browser_entry);
 

dlls/mshtml/mshtml_private.h

@@ -475,7 +475,6 @@ struct HTMLOuterWindow {
 
     LONG task_magic;
 
-    HTMLDocumentObj *doc_obj;
     nsIDOMWindow *nswindow;
     mozIDOMWindowProxy *window_proxy;
     HTMLOuterWindow *parent;