PlzNavigate: Fix ordering of onBeforeNavigate and onCreatedNavigationTarget.

chrome/browser/extensions/api/web_navigation/web_navigation_api.h

Index: chrome/browser/extensions/api/web_navigation/web_navigation_api.h
diff --git a/chrome/browser/extensions/api/web_navigation/web_navigation_api.h b/chrome/browser/extensions/api/web_navigation/web_navigation_api.h
index 47a2915470d4df2f34b45667434d48565723c80e..c663e68fb58ebd86a4e56a06cd6ff47510787e3e 100644
--- a/chrome/browser/extensions/api/web_navigation/web_navigation_api.h
+++ b/chrome/browser/extensions/api/web_navigation/web_navigation_api.h
@@ -71,6 +71,9 @@ class WebNavigationTabObserver
                            ui::PageTransition transition) override;
   void WebContentsDestroyed() override;
 
+  // This method dispatches the already created onBeforeNavigate event.
+  void DispatchCachedOnBeforeNavigate();
+
  private:
   explicit WebNavigationTabObserver(content::WebContents* web_contents);
   friend class content::WebContentsUserData<WebNavigationTabObserver>;
@@ -95,6 +98,11 @@ class WebNavigationTabObserver
   // Tracks the state of the frames we are sending events for.
   FrameNavigationState navigation_state_;
 
+  // The latest onBeforeNavigate event this frame has generated. It is stored
+  // as it might not be sent immediately, but delayed until the tab is added to
+  // the tab strip and is ready to dispatch events.
+  std::unique_ptr<Event> pending_on_before_navigate_event_;
+
   // Used for tracking registrations to redirect notifications.
   content::NotificationRegistrar registrar_;