Remove CancelRequest for PermissionManager

https://chromium-review.googlesource.com/c/chromium/src/+/876746

atom/browser/atom_permission_manager.cc

@@ -186,15 +186,6 @@ void AtomPermissionManager::OnPermissionResponse(
   }
 }
 
-void AtomPermissionManager::CancelPermissionRequest(int request_id) {
-  auto* pending_request = pending_requests_.Lookup(request_id);
-  if (!pending_request)
-    return;
-
-  if (!WebContentsDestroyed(pending_request->render_process_id()))
-    pending_request->RunCallback();
-  pending_requests_.Remove(request_id);
-}
 
 void AtomPermissionManager::ResetPermission(content::PermissionType permission,
                                             const GURL& requesting_origin,

atom/browser/atom_permission_manager.h

@@ -73,7 +73,6 @@ class AtomPermissionManager : public content::PermissionManager {
                             blink::mojom::PermissionStatus status);
 
   // content::PermissionManager:
-  void CancelPermissionRequest(int request_id) override;
   void ResetPermission(content::PermissionType permission,
                        const GURL& requesting_origin,
                        const GURL& embedding_origin) override;