Create NavigationHandle after beforeunload with PlzNavigate.

content/browser/web_contents/aura/overscroll_navigation_overlay_unittest.cc

Index: content/browser/web_contents/aura/overscroll_navigation_overlay_unittest.cc
diff --git a/content/browser/web_contents/aura/overscroll_navigation_overlay_unittest.cc b/content/browser/web_contents/aura/overscroll_navigation_overlay_unittest.cc
index d46238d169665c8c4ccec51399972738ccac9af9..78c5e8bea4bc188d58d7b029fed2889bf1b94f5a 100644
--- a/content/browser/web_contents/aura/overscroll_navigation_overlay_unittest.cc
+++ b/content/browser/web_contents/aura/overscroll_navigation_overlay_unittest.cc
@@ -55,22 +55,11 @@ class ImmediateLoadObserver : WebContentsObserver {
   }
   ~ImmediateLoadObserver() override {}
 
-  // TODO: remove this method when PlzNavigate is turned on by default.
   void DidStartNavigationToPendingEntry(const GURL& url,
                                         ReloadType reload_type) override {
-    if (!IsBrowserSideNavigationEnabled()) {
-      // Simulate immediate web page load.
-      contents_->TestSetIsLoading(false);
-      Observe(nullptr);
-    }
-  }
-
-  void DidStartNavigation(NavigationHandle* navigation_handlee) override {
-    if (IsBrowserSideNavigationEnabled()) {
-      // Simulate immediate web page load.
-      contents_->TestSetIsLoading(false);
-      Observe(nullptr);
-    }
+    // Simulate immediate web page load.
+    contents_->TestSetIsLoading(false);
+    Observe(nullptr);
   }
 
  private: