Hold cros_component_installers in browser_process.

chrome/browser/component_updater/cros_component_installer.h

 // Copyright 2017 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_COMPONENT_UPDATER_CROS_COMPONENT_INSTALLER_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_CROS_COMPONENT_INSTALLER_H_
 
 #include <string>
 
 #include "build/build_config.h"
@@ skipping 39 matching lines @@
   std::string GetName() const override;
   update_client::InstallerAttributes GetInstallerAttributes() const override;
   std::vector<std::string> GetMimeTypes() const override;
   std::string name;
   std::string env_version;
   uint8_t kSha2Hash_[crypto::kSHA256Length] = {};
 
   DISALLOW_COPY_AND_ASSIGN(CrOSComponentInstallerTraits);
 };
 
+class CrOSComponentInstaller
+    : public component_updater::DefaultComponentInstaller {
+ public:
+  CrOSComponentInstaller(
+      std::unique_ptr<ComponentInstallerTraits> installer_traits);
+  std::unique_ptr<base::DictionaryValue> GetCurrentManifest();
+
+ private:
+  ~CrOSComponentInstaller() override;
+};
+
 // This class contains functions used to register and install a component.
 class CrOSComponent {
  public:
   //  Register and start installing a CrOS component.
   //  |install_callback| is triggered after install finishes and returns error
   //  code.
   //
   //  example:
   //  ...
   //  void load_callback(const std::string& result){
@@ skipping 45 matching lines @@
   static void InstallChromeOSComponent(
       ComponentUpdateService* cus,
       const std::string& id,
       const update_client::Callback& install_callback);
 };
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace component_updater
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_CROS_COMPONENT_INSTALLER_H_