Convert ActiveTabPermissionGranter to use the new navigation callbacks.

chrome/browser/extensions/active_tab_permission_granter.h

Index: chrome/browser/extensions/active_tab_permission_granter.h
diff --git a/chrome/browser/extensions/active_tab_permission_granter.h b/chrome/browser/extensions/active_tab_permission_granter.h
index e71b0cb8aa1d07c086a0af964ca562fd9deda2fe..79ce69ae872a7e865a428c151d32bfb8e2e892ca 100644
--- a/chrome/browser/extensions/active_tab_permission_granter.h
+++ b/chrome/browser/extensions/active_tab_permission_granter.h
@@ -46,9 +46,8 @@ class ActiveTabPermissionGranter
 
  private:
   // content::WebContentsObserver implementation.
-  void DidNavigateMainFrame(
-      const content::LoadCommittedDetails& details,
-      const content::FrameNavigateParams& params) override;
+  void DidFinishNavigation(
+      content::NavigationHandle* navigation_handle) override;
   void WebContentsDestroyed() override;
 
   // extensions::ExtensionRegistryObserver implementation.