Fix content script injection for cancelled loads with PlzNavigate.

chrome/browser/extensions/tab_helper.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_TAB_HELPER_H_
 #define CHROME_BROWSER_EXTENSIONS_TAB_HELPER_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 134 matching lines @@
 
   explicit TabHelper(content::WebContents* web_contents);
   friend class content::WebContentsUserData<TabHelper>;
 
   // Displays UI for completion of creating a bookmark hosted app.
   void FinishCreateBookmarkApp(const extensions::Extension* extension,
                                const WebApplicationInfo& web_app_info);
 
   // content::WebContentsObserver overrides.
   void RenderFrameCreated(content::RenderFrameHost* host) override;
+  void DidFinishNavigation(
+      content::NavigationHandle* navigation_handle) override;
   void DidNavigateMainFrame(
       const content::LoadCommittedDetails& details,
       const content::FrameNavigateParams& params) override;
   bool OnMessageReceived(const IPC::Message& message) override;
   bool OnMessageReceived(const IPC::Message& message,
                          content::RenderFrameHost* render_frame_host) override;
   void DidCloneToNewWebContents(
       content::WebContents* old_web_contents,
       content::WebContents* new_web_contents) override;
 
@@ skipping 122 matching lines @@
 
   // Generic weak ptr factory for posting callbacks.
   base::WeakPtrFactory<TabHelper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TabHelper);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_TAB_HELPER_H_