PlzNavigate: Fix WebUI creation logic for both cross and same site navigation.

content/browser/frame_host/render_frame_host_manager.h

Index: content/browser/frame_host/render_frame_host_manager.h
diff --git a/content/browser/frame_host/render_frame_host_manager.h b/content/browser/frame_host/render_frame_host_manager.h
index 59b4d7792f7ecba57db3085fb81abf5deb839947..15338be2d0de70f6d680a0daf3b0359aa460b58d 100644
--- a/content/browser/frame_host/render_frame_host_manager.h
+++ b/content/browser/frame_host/render_frame_host_manager.h
@@ -237,7 +237,7 @@ class CONTENT_EXPORT RenderFrameHostManager : public NotificationObserver {
   // PlzNavigate
   // Returns the speculative WebUI for the navigation (a newly created one or
   // the current one if it should be reused). If none is set returns nullptr.
-  WebUIImpl* speculative_web_ui_for_testing() const {
+  WebUIImpl* speculative_web_ui() const {
     return should_reuse_web_ui_ ? web_ui_.get() : speculative_web_ui_.get();
   }