Fix ResourceSchedulingFilter crash after ResourceDispatcher deleted

content/child/resource_dispatcher.h

Index: content/child/resource_dispatcher.h
diff --git a/content/child/resource_dispatcher.h b/content/child/resource_dispatcher.h
index 6646e3e42909d59b24abcb17eacfd43f292c3ecc..7c8475587b12b298a15f9d27a36d4f39ab0ff655 100644
--- a/content/child/resource_dispatcher.h
+++ b/content/child/resource_dispatcher.h
@@ -146,6 +146,10 @@ class CONTENT_EXPORT ResourceDispatcher : public IPC::Listener {
   void SetResourceSchedulingFilter(
       scoped_refptr<ResourceSchedulingFilter> resource_scheduling_filter);
 
+  base::WeakPtr<ResourceDispatcher> GetWeakPtr() {
+    return weak_factory_.GetWeakPtr();
+  }
+
  private:
   friend class URLResponseBodyConsumer;
   friend class ResourceDispatcherTest;