throttling_url_loader_unittest.cc.diff

diff --git a/third_party/blink/common/loader/throttling_url_loader_unittest.cc b/third_party/blink/common/loader/throttling_url_loader_unittest.cc
index 592695073167..0d0d7b0ea2da 100644
--- a/third_party/blink/common/loader/throttling_url_loader_unittest.cc
+++ b/third_party/blink/common/loader/throttling_url_loader_unittest.cc
@@ -513,10 +513,12 @@ TEST_F(ThrottlingURLLoaderTest, ModifyURLAndDeferRedirect) {
   throttle_->set_will_start_request_callback(
       base::BindRepeating([](blink::URLLoaderThrottle::Delegate* /* delegate */,
                              bool* defer) { *defer = true; }));
+  base::RunLoop run_loop;
+  auto quit_closure = run_loop.QuitClosure();
   throttle_->set_will_redirect_request_callback(base::BindLambdaForTesting(
-      [](blink::URLLoaderThrottle::Delegate* /* delegate */, bool* defer,
+      [quit_closure](blink::URLLoaderThrottle::Delegate* /* delegate */, bool* defer,
          std::vector<std::string>* /* removed_headers */,
-         net::HttpRequestHeaders* /* modified_headers */) { *defer = true; }));
+         net::HttpRequestHeaders* /* modified_headers */) { *defer = true; quit_closure.Run(); }));
 
   CreateLoaderAndStart();
 
@@ -524,6 +526,7 @@ TEST_F(ThrottlingURLLoaderTest, ModifyURLAndDeferRedirect) {
   EXPECT_EQ(0u, throttle_->will_redirect_request_called());
 
   throttle_->delegate()->Resume();
+  run_loop.Run();
 
   EXPECT_EQ(1u, throttle_->will_start_request_called());
   EXPECT_EQ(1u, throttle_->will_redirect_request_called());