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 429bf34a2cfd122d66c0e568c6c060effdad5bfa..a90caf5e6614805ba293bdeef3316b19435de11b 100644
--- a/components/test_runner/test_runner.cc
+++ b/components/test_runner/test_runner.cc
@@ -2236,7 +2236,12 @@ bool TestRunnerForSpecificView::IsCommandEnabled(const std::string& command) {
 }
 
 bool TestRunnerForSpecificView::CallShouldCloseOnWebView() {
-  return web_view()->mainFrame()->dispatchBeforeUnloadEvent();
+  if (web_view()->mainFrame()->toWebLocalFrame()->dispatchBeforeUnloadEvent(
+          false) == blink::WebLocalFrame::BeforeUnloadReturnValue::Proceed) {
+    return true;
+  }
+
+  return false;
 }
 
 void TestRunnerForSpecificView::SetDomainRelaxationForbiddenForURLScheme(