Bug 1646519: Fix GetInProcessTopInternal usage in GetZone. r=nika

Differential Revision: https://phabricator.services.mozilla.com/D80092

docshell/base/WindowContext.cpp

@@ -12,6 +12,7 @@
 #include "mozilla/dom/BrowsingContext.h"
 #include "mozilla/StaticPtr.h"
 #include "mozilla/ClearOnShutdown.h"
+#include "nsGlobalWindowInner.h"
 #include "nsIScriptError.h"
 #include "nsRefPtrHashtable.h"
 #include "nsContentUtils.h"
@@ -53,6 +54,14 @@ bool WindowContext::IsCached() const {
   return mBrowsingContext->mCurrentWindowContext != this;
 }
 
+nsGlobalWindowInner* WindowContext::GetInnerWindow() const {
+  if (mInProcess) {
+    // FIXME: Replace this with something more efficient.
+    return nsGlobalWindowInner::GetInnerWindowWithId(mInnerWindowId);
+  }
+  return nullptr;
+}
+
 WindowContext* WindowContext::GetParentWindowContext() {
   return mBrowsingContext->GetParentWindowContext();
 }