Run unload handlers when navigating to about:blank using PlzNavigate.

chrome/browser/extensions/extension_resource_request_policy_apitest.cc

 // Copyright (c) 2012 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 "base/command_line.h"
 #include "base/logging.h"
 #include "build/build_config.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/test_switches.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
+#include "content/public/common/browser_side_navigation_policy.h"
 #include "content/public/test/browser_test_utils.h"
 #include "extensions/common/switches.h"
 #include "net/dns/mock_host_resolver.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 #include "url/gurl.h"
 
 class ExtensionResourceRequestPolicyTest : public ExtensionApiTest {
  protected:
   void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionApiTest::SetUpCommandLine(command_line);
@@ skipping 220 matching lines @@
       browser(), accessible_linked_resource, 1);
   ASSERT_TRUE(content::ExecuteScriptAndExtractString(
       browser()->tab_strip_model()->GetActiveWebContents(),
       "window.domAutomationController.send(document.URL)",
       &result));
   EXPECT_NE("about:blank", result);
 
   GURL nonaccessible_linked_resource(embedded_test_server()->GetURL(
       "/extensions/api_test/extension_resource_request_policy/"
       "web_accessible/nonaccessible_link_resource.html"));
+  // With PlzNavigate, the first DidStopLoading IPC is dropped because loading
+  // is delayed until the beforeunload handler ACK comes back.
   ui_test_utils::NavigateToURLBlockUntilNavigationsComplete(browser(),
-      nonaccessible_linked_resource, 2);
+      nonaccessible_linked_resource,
+      content::IsBrowserSideNavigationEnabled() ? 1 : 2);
   ASSERT_TRUE(content::ExecuteScriptAndExtractString(
       browser()->tab_strip_model()->GetActiveWebContents(),
       "window.domAutomationController.send(document.URL)",
       &result));
   EXPECT_EQ("about:blank", result);
 
 
   // Redirects can sometimes occur before the load event, so use a
   // UrlLoadObserver instead of blocking waiting for two load events.
   GURL accessible_url = extension->GetResourceURL("/test.png");
@@ skipping 111 matching lines @@
 
   content::WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
 
   GURL private_page(
       "chrome-extension://kegmjfcnjamahdnldjmlpachmpielcdk/private.html");
   NavigationErrorObserver observer(web_contents, private_page);
   ASSERT_TRUE(content::ExecuteScript(web_contents, "navigateFrameNow()"));
   observer.Wait();
 }