Introduce restricted PasswordFormManager::GrabFetcher

components/password_manager/core/browser/password_form_manager.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 COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_PASSWORD_FORM_MANAGER_H_
 #define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_PASSWORD_FORM_MANAGER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 228 matching lines @@
   void SaveGenerationFieldDetectedByClassifier(
       const base::string16& generation_field);
 
   FormSaver* form_saver() { return form_saver_.get(); }
 
   // Clears references to matches derived from the associated FormFetcher data.
   // After calling this, the PasswordFormManager holds no references to objects
   // owned by the associated FormFetcher.
   void ResetStoredMatches();
 
+  // Takes ownership of |fetcher|.
+  // TODO(crbug.com/621355) Until https://codereview.chromium.org/2758773002/,
+  // |fetcher.get()| must be the same as |form_fetcher_|.
+  void GrabFetcher(std::unique_ptr<FormFetcher> fetcher);
+
  protected:
   // FormFetcher::Consumer:
   void ProcessMatches(
       const std::vector<const autofill::PasswordForm*>& non_federated,
       size_t filtered_count) override;
 
  private:
   // ManagerAction - What does the manager do with this form? Either it
   // fills it, or it doesn't. If it doesn't fill it, that's either
   // because it has no match or it is disabled via the AUTOCOMPLETE=off
@@ skipping 299 matching lines @@
   FormType form_type_;
 
   // FormSaver instance used by |this| to all tasks related to storing
   // credentials.
   std::unique_ptr<FormSaver> form_saver_;
 
   // When not null, then this is the object which |form_fetcher_| points to.
   std::unique_ptr<FormFetcher> owned_form_fetcher_;
 
   // FormFetcher instance which owns the login data from PasswordStore.
-  FormFetcher* const form_fetcher_;
+  FormFetcher* form_fetcher_;
 
   // True if the main frame's visible URL, at the time this PasswordFormManager
   // was created, is secure.
   bool is_main_frame_secure_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordFormManager);
 };
 
 }  // namespace password_manager
 
 #endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_PASSWORD_FORM_MANAGER_H_