Fix some unit_tests under PlzNavigate

chrome/test/base/browser_with_test_window_test.cc

Index: chrome/test/base/browser_with_test_window_test.cc
diff --git a/chrome/test/base/browser_with_test_window_test.cc b/chrome/test/base/browser_with_test_window_test.cc
index 967d987a9767d7bd18ab6778fd9090bf329c94f7..f7761aac2049e5cc3e61e56be1f994cf9a4738d7 100644
--- a/chrome/test/base/browser_with_test_window_test.cc
+++ b/chrome/test/base/browser_with_test_window_test.cc
@@ -19,6 +19,8 @@
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/browser_side_navigation_policy.h"
+#include "content/public/test/browser_side_navigation_test_utils.h"
 #include "content/public/test/test_renderer_host.h"
 #include "ui/base/page_transition_types.h"
 
@@ -65,6 +67,9 @@ void BrowserWithTestWindowTest::SetUp() {
   SetConstrainedWindowViewsClient(CreateChromeConstrainedWindowViewsClient());
 #endif
 
+  if (content::IsBrowserSideNavigationEnabled())
+    content::BrowserSideNavigationSetUp();
+
   // Subclasses can provide their own Profile.
   profile_ = CreateProfile();
   // Subclasses can provide their own test BrowserWindow. If they return NULL
@@ -85,6 +90,9 @@ void BrowserWithTestWindowTest::TearDown() {
   // audio service) depend on test stubs that the helpers below will remove.
   DestroyBrowserAndProfile();
 
+  if (content::IsBrowserSideNavigationEnabled())
+    content::BrowserSideNavigationTearDown();
+
 #if defined(TOOLKIT_VIEWS)
   constrained_window::SetConstrainedWindowViewsClient(nullptr);
 #endif
@@ -128,15 +136,12 @@ void BrowserWithTestWindowTest::CommitPendingLoad(
     return;  // Nothing to commit.
 
   RenderFrameHost* old_rfh = controller->GetWebContents()->GetMainFrame();
+  RenderFrameHostTester* old_rfh_tester = RenderFrameHostTester::For(old_rfh);
+  old_rfh_tester->SimulateUnloading();
 
   RenderFrameHost* pending_rfh = RenderFrameHostTester::GetPendingForController(
       controller);
-  if (pending_rfh) {
-    // Simulate the BeforeUnload_ACK that is received from the current renderer
-    // for a cross-site navigation.
-    DCHECK_NE(old_rfh, pending_rfh);
-    RenderFrameHostTester::For(old_rfh)->SendBeforeUnloadACK(true);
-  }
+
   // Commit on the pending_rfh, if one exists.
   RenderFrameHost* test_rfh = pending_rfh ? pending_rfh : old_rfh;
   RenderFrameHostTester* test_rfh_tester = RenderFrameHostTester::For(test_rfh);