PlzNavigate: properly execute BeforeUnload on renderer initiated navigations

components/test_runner/test_runner.cc

Index: components/test_runner/test_runner.cc
diff --git a/components/test_runner/test_runner.cc b/components/test_runner/test_runner.cc
index 2d0597ab35ef5f5941235f9e3da67d9e2a826413..f0295e4137117a9bbca91738fd471d84c5e196b0 100644
--- a/components/test_runner/test_runner.cc
+++ b/components/test_runner/test_runner.cc
@@ -2228,7 +2228,13 @@ bool TestRunnerForSpecificView::IsCommandEnabled(const std::string& command) {
 }
 
 bool TestRunnerForSpecificView::CallShouldCloseOnWebView() {
-  return web_view()->mainFrame()->dispatchBeforeUnloadEvent();
+  bool proceed = false;
+  if (!web_view()->mainFrame()->toWebLocalFrame()->dispatchBeforeUnloadEvent(
+          &proceed)) {
+    return false;
+  }
+
+  return proceed;
 }
 
 void TestRunnerForSpecificView::SetDomainRelaxationForbiddenForURLScheme(