PlzNavigate: Call NavigationHandle::WillProcessResponse for 204/205s

content/test/test_navigation_url_loader_delegate.cc

Index: content/test/test_navigation_url_loader_delegate.cc
diff --git a/content/test/test_navigation_url_loader_delegate.cc b/content/test/test_navigation_url_loader_delegate.cc
index cc8f0b3b145eed869c277fd68f4d065eeeb9dcb5..443749b0cf458893fea085c145f43cf80301c773 100644
--- a/content/test/test_navigation_url_loader_delegate.cc
+++ b/content/test/test_navigation_url_loader_delegate.cc
@@ -65,8 +65,8 @@ void TestNavigationURLLoaderDelegate::OnResponseStarted(
     bool is_stream) {
   response_ = response;
   body_ = std::move(body);
-  ASSERT_TRUE(response_started_);
-  response_started_->Quit();
+  if (response_started_)
+    response_started_->Quit();
 }
 
 void TestNavigationURLLoaderDelegate::OnRequestFailed(bool in_cache,