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

extensions/browser/updater/update_install_shim.h

 // Copyright 2015 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 EXTENSIONS_BROWSER_UPDATER_UPDATE_INSTALL_SHIM_H_
 #define EXTENSIONS_BROWSER_UPDATER_UPDATE_INSTALL_SHIM_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 26 matching lines @@
   // of it to install.
   UpdateInstallShim(std::string extension_id,
                     const base::FilePath& extension_root,
                     const UpdateInstallShimCallback& callback);
 
   // Called when an update attempt failed.
   void OnUpdateError(int error) override;
 
   // This is called when a new version of an extension is unpacked at
   // |unpack_path| and is ready for install.
-  CrxInstaller::Result Install(const base::DictionaryValue& manifest,
-                               const base::FilePath& unpack_path) override;
+  bool Install(const base::DictionaryValue& manifest,
+               const base::FilePath& unpack_path) override;
 
   // This is called by the generic differential update code in the
   // update_client to provide the path to an existing file in the current
   // version of the extension, so that it can be copied (or serve as the input
   // to diff-patching) with output going to the directory with the new version
   // being staged on disk for install.
   bool GetInstalledFile(const std::string& file,
                         base::FilePath* installed_file) override;
 
   // This method is not relevant to extension updating.
   bool Uninstall() override;
 
  private:
   friend class base::RefCountedThreadSafe<UpdateInstallShim>;
   ~UpdateInstallShim() override;
 
   // Takes ownership of the directory at path |temp_dir|.
   void RunCallbackOnUIThread(const base::FilePath& temp_dir);
 
   std::string extension_id_;
   base::FilePath extension_root_;
   UpdateInstallShimCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(UpdateInstallShim);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_UPDATER_UPDATE_INSTALL_SHIM_H_