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

chrome/browser/component_updater/sth_set_component_installer.h

 // 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.
 
 #ifndef CHROME_BROWSER_COMPONENT_UPDATER_STH_SET_COMPONENT_INSTALLER_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_STH_SET_COMPONENT_INSTALLER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 32 matching lines @@
   // The |sth_distributor| will be notified each time a new STH is observed.
   explicit STHSetComponentInstallerTraits(net::ct::STHObserver* sth_observer);
   ~STHSetComponentInstallerTraits() override;
 
  private:
   friend class STHSetComponentInstallerTest;
 
   // ComponentInstallerTraits implementation.
   bool SupportsGroupPolicyEnabledComponentUpdates() const override;
   bool RequiresNetworkEncryption() const override;
-  update_client::CrxInstaller::Result OnCustomInstall(
-      const base::DictionaryValue& manifest,
-      const base::FilePath& install_dir) override;
+  bool OnCustomInstall(const base::DictionaryValue& manifest,
+                       const base::FilePath& install_dir) override;
   bool VerifyInstallation(const base::DictionaryValue& manifest,
                           const base::FilePath& install_dir) const override;
   void ComponentReady(const base::Version& version,
                       const base::FilePath& install_dir,
                       std::unique_ptr<base::DictionaryValue> manifest) override;
   base::FilePath GetRelativeInstallDir() const override;
   void GetHash(std::vector<uint8_t>* hash) const override;
   std::string GetName() const override;
   update_client::InstallerAttributes GetInstallerAttributes() const override;
   std::vector<std::string> GetMimeTypes() const override;
@@ skipping 18 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(STHSetComponentInstallerTraits);
 };
 
 void RegisterSTHSetComponent(ComponentUpdateService* cus,
                              const base::FilePath& user_data_dir);
 
 }  // namespace component_updater
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_STH_SET_COMPONENT_INSTALLER_H_