Hold cros_component_installers in browser_process.

components/component_updater/default_component_installer.h

 // Copyright 2014 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_COMPONENT_UPDATER_DEFAULT_COMPONENT_INSTALLER_H_
 #define COMPONENTS_COMPONENT_UPDATER_DEFAULT_COMPONENT_INSTALLER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 106 matching lines @@
   // Overridden from ComponentInstaller:
   void OnUpdateError(int error) override;
   update_client::CrxInstaller::Result Install(
       const base::DictionaryValue& manifest,
       const base::FilePath& unpack_path) override;
   bool GetInstalledFile(const std::string& file,
                         base::FilePath* installed_file) override;
   // Only user-level component installations can be uninstalled.
   bool Uninstall() override;
 
+ protected:
+  ~DefaultComponentInstaller() override;
+  std::unique_ptr<base::DictionaryValue> current_manifest_;

[sky, 2017/05/24 16:47:20]

Style guide says no protected members.

[xiaochu, 2017/05/24 19:56:54]

Done.

+
  private:
-  ~DefaultComponentInstaller() override;
-
   // If there is a installation of the component set up alongside Chrome's
   // files (as opposed to in the user data directory), sets current_* to the
   // values associated with that installation and returns true; otherwise,
   // returns false.
   bool FindPreinstallation(const base::FilePath& root);
   update_client::CrxInstaller::Result InstallHelper(
       const base::DictionaryValue& manifest,
       const base::FilePath& unpack_path,
       const base::FilePath& install_path);
   void StartRegistration(ComponentUpdateService* cus);
   void FinishRegistration(ComponentUpdateService* cus,
                           const base::Closure& callback);
   void ComponentReady(std::unique_ptr<base::DictionaryValue> manifest);
   void UninstallOnTaskRunner();
 
   base::FilePath current_install_dir_;
   base::Version current_version_;
   std::string current_fingerprint_;
-  std::unique_ptr<base::DictionaryValue> current_manifest_;
   std::unique_ptr<ComponentInstallerTraits> installer_traits_;
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
 
   // Used to post responses back to the main thread. Initialized on the main
   // loop but accessed from the task runner.
   scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultComponentInstaller);
 };
 
 }  // namespace component_updater
 
 #endif  // COMPONENTS_COMPONENT_UPDATER_DEFAULT_COMPONENT_INSTALLER_H_