PlzNavigate: avoid checking navigation policy twice for render-init requests.

components/test_runner/web_frame_test_client.cc

Index: components/test_runner/web_frame_test_client.cc
diff --git a/components/test_runner/web_frame_test_client.cc b/components/test_runner/web_frame_test_client.cc
index ca0aa871cf8c7080239684ef9614ce313809b63e..75c5d88245480fffb2c0c5eac2592b748311dcfa 100644
--- a/components/test_runner/web_frame_test_client.cc
+++ b/components/test_runner/web_frame_test_client.cc
@@ -657,6 +657,13 @@ void WebFrameTestClient::didAddMessageToConsole(
 
 blink::WebNavigationPolicy WebFrameTestClient::decidePolicyForNavigation(
     const blink::WebFrameClient::NavigationPolicyInfo& info) {
+  // PlzNavigate
+  // Navigation requests initiated by the renderer have checked navigation
+  // policy when the navigation was sent to the browser. Some layout tests
+  // expect that navigation policy is only checked once.
+  if (delegate_->IsNavigationInitiatedByRenderer(info.urlRequest))
+    return info.defaultPolicy;
+
   if (test_runner()->shouldDumpNavigationPolicy()) {
     delegate_->PrintMessage("Default policy for navigation to '" +
                             URLDescription(info.urlRequest.url()) + "' is '" +