PlzNavigate: support NavigationThrottle::WillProcessResponse

content/test/test_navigation_url_loader.cc

Index: content/test/test_navigation_url_loader.cc
diff --git a/content/test/test_navigation_url_loader.cc b/content/test/test_navigation_url_loader.cc
index ecb3b1014964f0d2cc99aa25a62617487afa3a1a..1594e2913003f8af2aaadd60191ee7f046dda9dd 100644
--- a/content/test/test_navigation_url_loader.cc
+++ b/content/test/test_navigation_url_loader.cc
@@ -18,12 +18,17 @@ TestNavigationURLLoader::TestNavigationURLLoader(
     NavigationURLLoaderDelegate* delegate)
     : request_info_(std::move(request_info)),
       delegate_(delegate),
-      redirect_count_(0) {}
+      redirect_count_(0),
+      response_proceeded_(false) {}
 
 void TestNavigationURLLoader::FollowRedirect() {
   redirect_count_++;
 }
 
+void TestNavigationURLLoader::ProceedWithResponse() {
+  response_proceeded_ = true;
+}
+
 void TestNavigationURLLoader::SimulateServerRedirect(const GURL& redirect_url) {
   net::RedirectInfo redirect_info;
   redirect_info.status_code = 302;