import changes from `dev' branch of rmottola/Arctic-Fox:

- Bug 1144745 - moves gdk_screen_get_monitor_scale_factor() call to nsScreenGtk :: GetGtkMonitorScaleFactor(). r=karlt (0294af0ce)
- Bug 1073117 - Add support for has_tab_gap notebook style. r=karlt (2c7473bde)
- reverto to about 1174950 level (faf115418)
- Bug 1183356 - Part 1: Use the outer window when refreshing media elements; r=baku (772e3a6aa)
- Bug 1183356 - Part 2: Add assertions enforcing the usage of outer windows for all of the entry points of the API; r=baku (a2d47c945)
- Bug 1181916. Notify the debugger's onNewGlobalObject hook off a scriptrunner. r=bholley (2ac890b4d)
- Bug 1182316: Part 2 - Rework FORWARD_TO_OUTER_OR_THROW. r=peterv (aea3061d2)
- Bug 1169710 - Part 0: Document the Debugger.Memory's tenure promotions log; r=sfink (c7520ed31)
- Bug 1169710 - Part 1: Debugger should maintain a set of debuggee zones and Zones should maintain a list of debuggers; r=sfink (2d5025ba2)
- Bug 1169710 - Part 2: Add Debugger infrastructure for logging promotions to the tenured heap; r=sfink (c0bc4fbfc)
- Bug 1169710 - Part 3: Expose the tenure promotions log on Debugger.Memory; r=sfink (e37b65fe0)
- Bug 1169710 - Part 4: Test the tenuring log; r=sfink (4cb0e3905)
- Bug 1169710 - Part 5: Fix a GC hazard and properly mark cross compartment edges in the tenure promotions log; r=sfink,jonco (80235f6c7)

docshell/base/nsDocShell.cpp

@@ -3730,12 +3730,10 @@ nsDocShell::CanAccessItem(nsIDocShellTreeItem* aTargetItem,
 static bool
 ItemIsActive(nsIDocShellTreeItem* aItem)
 {
-  nsCOMPtr<nsPIDOMWindow> window = aItem->GetWindow();
-
-  if (window) {
-    bool isClosed;
-
-    if (NS_SUCCEEDED(window->GetClosed(&isClosed)) && !isClosed) {
+  if (nsCOMPtr<nsPIDOMWindow> window = aItem->GetWindow()) {
+    auto* win = static_cast<nsGlobalWindow*>(window.get());
+    MOZ_ASSERT(win->IsOuterWindow());
+    if (!win->GetClosedOuter()) {
       return true;
     }
   }