PlzNavigate: properly execute BeforeUnload on renderer initiated navigations

components/test_runner/test_runner.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/test_runner/test_runner.h"
 
 #include <stddef.h>
 #include <limits>
 #include <utility>
 
@@ skipping 2210 matching lines @@
   web_view()->focusedFrame()->executeCommand(WebString::fromUTF8(command),
                                              WebString::fromUTF8(value));
 }
 
 bool TestRunnerForSpecificView::IsCommandEnabled(const std::string& command) {
   return web_view()->focusedFrame()->isCommandEnabled(
       WebString::fromUTF8(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(
     bool forbidden,
     const std::string& scheme) {
   web_view()->setDomainRelaxationForbidden(forbidden,
                                            WebString::fromUTF8(scheme));
 }
 
 v8::Local<v8::Value>
@@ skipping 1122 matching lines @@
 
 blink::WebView* TestRunnerForSpecificView::web_view() {
   return web_test_proxy_base_->web_view();
 }
 
 WebTestDelegate* TestRunnerForSpecificView::delegate() {
   return web_test_proxy_base_->delegate();
 }
 
 }  // namespace test_runner