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..be59550dbd2ed5ec73948f370ebd6eb3078f46cb 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
@@ -128,6 +133,7 @@ void BrowserWithTestWindowTest::CommitPendingLoad(
     return;  // Nothing to commit.
 
   RenderFrameHost* old_rfh = controller->GetWebContents()->GetMainFrame();
+  content::SimulateCurrentRenderFrameHostUnloading(old_rfh);
 
   RenderFrameHost* pending_rfh = RenderFrameHostTester::GetPendingForController(
       controller);