Hold cros_component_installers in browser_process.

chrome/test/base/testing_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.
 
 // An implementation of BrowserProcess for unit tests that fails for most
 // services. By preventing creation of services, we reduce dependencies and
 // keep the profile clean. Clients of this class must handle the NULL return
 // value, however.
 
 #ifndef CHROME_TEST_BASE_TESTING_BROWSER_PROCESS_H_
@@ skipping 99 matching lines @@
 
 #if (defined(OS_WIN) || defined(OS_LINUX)) && !defined(OS_CHROMEOS)
   void StartAutoupdateTimer() override {}
 #endif
 
   net_log::ChromeNetLog* net_log() override;
   component_updater::ComponentUpdateService* component_updater() override;
   CRLSetFetcher* crl_set_fetcher() override;
   component_updater::PnaclComponentInstaller* pnacl_component_installer()
       override;
+#if defined(OS_CHROMEOS)
+  component_updater::DefaultComponentInstaller* cros_component_installer(
+      const std::string& name,
+      std::unique_ptr<component_updater::ComponentInstallerTraits>
+          installer_traits) override;
+#endif
+
   component_updater::SupervisedUserWhitelistInstaller*
   supervised_user_whitelist_installer() override;
   MediaFileSystemRegistry* media_file_system_registry() override;
   bool created_local_state() const override;
 
 #if BUILDFLAG(ENABLE_WEBRTC)
   WebRtcLogUploader* webrtc_log_uploader() override;
 #endif
 
   network_time::NetworkTimeTracker* network_time_tracker() override;
@@ skipping 97 matching lines @@
 class TestingBrowserProcessInitializer {
  public:
   TestingBrowserProcessInitializer();
   ~TestingBrowserProcessInitializer();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestingBrowserProcessInitializer);
 };
 
 #endif  // CHROME_TEST_BASE_TESTING_BROWSER_PROCESS_H_