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

chrome/browser/component_updater/ev_whitelist_component_installer.h

 // Copyright 2014 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_EV_WHITELIST_COMPONENT_INSTALLER_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_EV_WHITELIST_COMPONENT_INSTALLER_H_
 
 #include <stdint.h>
 #include <memory>
 #include <string>
@@ skipping 14 matching lines @@
 
 class EVWhitelistComponentInstallerTraits : public ComponentInstallerTraits {
  public:
   EVWhitelistComponentInstallerTraits() {}
   ~EVWhitelistComponentInstallerTraits() override {}
 
  private:
   // The following methods override ComponentInstallerTraits.
   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;
 
   static base::FilePath GetInstalledPath(const base::FilePath& base);
 
   DISALLOW_COPY_AND_ASSIGN(EVWhitelistComponentInstallerTraits);
 };
 
 // Call once during startup to make the component update service aware of
 // the EV whitelist.
 void RegisterEVWhitelistComponent(ComponentUpdateService* cus,
                                   const base::FilePath& user_data_dir);
 
 }  // namespace component_updater
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_EV_WHITELIST_COMPONENT_INSTALLER_H_