Hold cros_component_installers in browser_process.

chrome/browser/browser_process.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.
 
 // This interface is for managing the global services of the application. Each
 // service is lazily created when requested the first time. The service getters
 // will return NULL if the service is not available, so callers must check for
 // this condition.
 
 #ifndef CHROME_BROWSER_BROWSER_PROCESS_H_
@@ skipping 36 matching lines @@
 
 namespace subresource_filter {
 class ContentRulesetService;
 }
 
 namespace variations {
 class VariationsService;
 }
 
 namespace component_updater {
+class ComponentInstallerTraits;
 class ComponentUpdateService;
+class DefaultComponentInstaller;
 class PnaclComponentInstaller;
 class SupervisedUserWhitelistInstaller;
 }
 
 namespace extensions {
 class EventRouterForwarder;
 }
 
 namespace gcm {
 class GCMDriver;
@@ skipping 214 matching lines @@
 
   // Returns the default web client state of Chrome (i.e., was it the user's
   // default browser) at the time a previous check was made sometime between
   // process startup and now.
   virtual shell_integration::DefaultWebClientState
   CachedDefaultWebClientState() = 0;
 
   // Returns the Physical Web data source.
   virtual physical_web::PhysicalWebDataSource* GetPhysicalWebDataSource() = 0;
 
+#if defined(OS_CHROMEOS)

[sky, 2017/05/23 20:22:23]

Can this be moved to browser_process_platform_part_chromeos?

[xiaochu, 2017/05/23 21:31:59]

Done.

+  virtual component_updater::DefaultComponentInstaller*
+  cros_component_installer(

[sky, 2017/05/23 20:22:23]

Please name this GetCrosComponentInstaller().

[xiaochu, 2017/05/23 21:31:59]

Done.

+      const std::string& name,
+      std::unique_ptr<component_updater::ComponentInstallerTraits>
+          installer_traits) = 0;
+#endif
+
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserProcess);
 };
 
 extern BrowserProcess* g_browser_process;
 
 #endif  // CHROME_BROWSER_BROWSER_PROCESS_H_