Network service: avoid requesting a new URLLoaderFactory for each NavigationURLLoaderNetworkService.

content/browser/site_per_process_browsertest.cc

Index: content/browser/site_per_process_browsertest.cc
diff --git a/content/browser/site_per_process_browsertest.cc b/content/browser/site_per_process_browsertest.cc
index 75ef2d135b6d56d56a19765cf4b4d4211715e1f1..83dd76495b0c5873bd0ff34b93d0b9e8fe8b9d61 100644
--- a/content/browser/site_per_process_browsertest.cc
+++ b/content/browser/site_per_process_browsertest.cc
@@ -2565,8 +2565,12 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest, ProcessTransferAfterError) {
   EXPECT_EQ("null", child->current_origin().Serialize());
 
   // Try again after re-enabling host resolution.
-  if (!network_service)
+  if (network_service) {
+    NavigationURLLoaderNetworkService::OverrideURLLoaderFactoryForTesting(
+        nullptr);
+  } else {
     host_resolver()->AddRule("*", "127.0.0.1");
+  }
 
   NavigateIframeToURL(shell()->web_contents(), "child-0", url_b);
   EXPECT_TRUE(observer.last_navigation_succeeded());