Fix some unit_tests under PlzNavigate

content/test/test_web_contents.cc

Index: content/test/test_web_contents.cc
diff --git a/content/test/test_web_contents.cc b/content/test/test_web_contents.cc
index 7807ffaa804cd54659f481ace694e51416a16efd..0918d5e9c57b38237d33895afacd17ee3f3a5bad 100644
--- a/content/test/test_web_contents.cc
+++ b/content/test/test_web_contents.cc
@@ -22,6 +22,7 @@
 #include "content/public/browser/notification_types.h"
 #include "content/public/common/browser_side_navigation_policy.h"
 #include "content/public/common/page_state.h"
+#include "content/public/test/browser_side_navigation_test_utils.h"
 #include "content/public/test/mock_render_process_host.h"
 #include "content/test/test_render_view_host.h"
 #include "ui/base/page_transition_types.h"
@@ -217,31 +218,13 @@ void TestWebContents::CommitPendingNavigation() {
   const NavigationEntry* entry = GetController().GetPendingEntry();
   DCHECK(entry);
 
-  // If we are doing a cross-site navigation, this simulates the current RFH
-  // notifying that it has unloaded so the pending RFH is resumed and can
-  // navigate.
-  // PlzNavigate: the pending RFH is not created before the navigation commit,
-  // so it is necessary to simulate the IO thread response here to commit in the
-  // proper renderer. It is necessary to call PrepareForCommit before getting
-  // the main and the pending frame because when we are trying to navigate to a
-  // webui from a new tab, a RenderFrameHost is created to display it that is
-  // committed immediately (since it is a new tab). Therefore the main frame is
-  // replaced without a pending frame being created, and we don't get the right
-  // values for the RFH to navigate: we try to use the old one that has been
-  // deleted in the meantime.
-  // Note that for some synchronous navigations (about:blank, javascript
-  // urls, etc.) there will be no NavigationRequest, and no simulation of the
-  // network stack is required.
-  bool browser_side_navigation = IsBrowserSideNavigationEnabled();
-  if (!browser_side_navigation ||
-      GetMainFrame()->frame_tree_node()->navigation_request()) {
-    GetMainFrame()->PrepareForCommit();
-  }
-
   TestRenderFrameHost* old_rfh = GetMainFrame();
+  old_rfh->SimulateUnloading();
+
   TestRenderFrameHost* rfh = GetPendingMainFrame();
   if (!rfh)
     rfh = old_rfh;
+  const bool browser_side_navigation = IsBrowserSideNavigationEnabled();
   CHECK(!browser_side_navigation || rfh->is_loading());
   CHECK(!browser_side_navigation ||
         !rfh->frame_tree_node()->navigation_request());