Fix CHECK that's being fired inside NavigationControllerImpl::RendererDidNavigateToExistingPage.

content/browser/frame_host/navigation_controller_impl.cc

Index: content/browser/frame_host/navigation_controller_impl.cc
diff --git a/content/browser/frame_host/navigation_controller_impl.cc b/content/browser/frame_host/navigation_controller_impl.cc
index 3e232d9c416186df7e5773ce46b8aa7a26ff21dc..2ffeafa8135ebb3637f3e81aa6b0cb018bf0caaf 100644
--- a/content/browser/frame_host/navigation_controller_impl.cc
+++ b/content/browser/frame_host/navigation_controller_impl.cc
@@ -1219,8 +1219,10 @@ void NavigationControllerImpl::RendererDidNavigateToExistingPage(
     // meanwhile and no new page was created. We are stuck at the last committed
     // entry.
     entry = GetLastCommittedEntry();
-    CHECK(!is_in_page);
-    entry->GetSSL() = handle->ssl_status();
+    // If this is an in-page navigation, then there's no SSLStatus in the
+    // NavigationHandle so don't overwrite the existing entry's SSLStatus.
+    if (!is_in_page)
+      entry->GetSSL() = handle->ssl_status();
   } else if (params.nav_entry_id) {
     // This is a browser-initiated navigation (back/forward/reload).
     entry = GetEntryWithUniqueID(params.nav_entry_id);