Fix the replaceState-while-pending tests to check to see that the pending entry isn't affected.

content/browser/frame_host/navigation_controller_impl_browsertest.cc

Index: content/browser/frame_host/navigation_controller_impl_browsertest.cc
diff --git a/content/browser/frame_host/navigation_controller_impl_browsertest.cc b/content/browser/frame_host/navigation_controller_impl_browsertest.cc
index cf9c8c79ecf8fda878cea954f280ea01daf508e6..1f2b243521c9e689157a668219e7c809c356169a 100644
--- a/content/browser/frame_host/navigation_controller_impl_browsertest.cc
+++ b/content/browser/frame_host/navigation_controller_impl_browsertest.cc
@@ -2912,9 +2912,9 @@ void DoReplaceStateWhilePending(Shell* shell,
       stalled_url, Referrer(), ui::PAGE_TRANSITION_LINK, std::string());
 
   // That should be the pending entry.
-  NavigationEntryImpl* entry = controller.GetPendingEntry();
-  ASSERT_NE(nullptr, entry);
-  EXPECT_EQ(stalled_url, entry->GetURL());
+  NavigationEntryImpl* original_pending_entry = controller.GetPendingEntry();
+  ASSERT_NE(nullptr, original_pending_entry);
+  EXPECT_EQ(stalled_url, original_pending_entry->GetURL());
 
   {
     // Now the existing page uses history.replaceState().
@@ -2929,6 +2929,10 @@ void DoReplaceStateWhilePending(Shell* shell,
     // classification.
     EXPECT_EQ(NAVIGATION_TYPE_EXISTING_PAGE, capturer.details().type);
     EXPECT_TRUE(capturer.details().is_in_page);
+
+    // That should not have affected the pending entry.
+    NavigationEntryImpl* pending_entry = controller.GetPendingEntry();
+    EXPECT_EQ(original_pending_entry, pending_entry);
   }
 
   ResourceDispatcherHost::Get()->SetDelegate(nullptr);