Revert of Makes the component installers return a Result instead of a bool.

chrome/browser/component_updater/sth_set_component_installer.cc

 // Copyright 2016 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.
 
 #include "chrome/browser/component_updater/sth_set_component_installer.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/files/file_enumerator.h"
@@ skipping 47 matching lines @@
 bool STHSetComponentInstallerTraits::
     SupportsGroupPolicyEnabledComponentUpdates() const {
   return false;
 }
 
 // Public data is delivered via this component, no need for encryption.
 bool STHSetComponentInstallerTraits::RequiresNetworkEncryption() const {
   return false;
 }
 
-update_client::CrxInstaller::Result
-STHSetComponentInstallerTraits::OnCustomInstall(
+bool STHSetComponentInstallerTraits::OnCustomInstall(
     const base::DictionaryValue& manifest,
     const base::FilePath& install_dir) {
-  return update_client::CrxInstaller::Result(0);  // Nothing custom here.
+  return true;  // Nothing custom here.
 }
 
 void STHSetComponentInstallerTraits::ComponentReady(
     const base::Version& version,
     const base::FilePath& install_dir,
     std::unique_ptr<base::DictionaryValue> manifest) {
   const base::Closure load_sths_closure = base::Bind(
       &STHSetComponentInstallerTraits::LoadSTHsFromDisk,
       weak_ptr_factory_.GetWeakPtr(), GetInstalledPath(install_dir), version);
 
@@ skipping 119 matching lines @@
 
   std::unique_ptr<ComponentInstallerTraits> traits(
       new STHSetComponentInstallerTraits(distributor));
   // |cus| will take ownership of |installer| during installer->Register(cus).
   DefaultComponentInstaller* installer =
       new DefaultComponentInstaller(std::move(traits));
   installer->Register(cus, base::Closure());
 }
 
 }  // namespace component_updater