Unconditionally delete the unpack path in the UpdateClient.

components/update_client/test_installer.h

 // Copyright 2013 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 COMPONENTS_UPDATE_CLIENT_TEST_INSTALLER_H_
 #define COMPONENTS_UPDATE_CLIENT_TEST_INSTALLER_H_
 
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 24 matching lines @@
 
   int error() const { return error_; }
 
   int install_count() const { return install_count_; }
 
  protected:
   ~TestInstaller() override;
 
   int error_;
   int install_count_;
+
+ private:
+  // Contains the |unpack_path| argument of the Install call.
+  base::FilePath unpack_path_;
 };
 
 // A ReadOnlyTestInstaller is an installer that knows about files in an existing
 // directory. It will not write to the directory.
 class ReadOnlyTestInstaller : public TestInstaller {
  public:
   explicit ReadOnlyTestInstaller(const base::FilePath& installed_path);
 
   bool GetInstalledFile(const std::string& file,
                         base::FilePath* installed_file) override;
@@ skipping 19 matching lines @@
  private:
   ~VersionedTestInstaller() override;
 
   base::FilePath install_directory_;
   base::Version current_version_;
 };
 
 }  // namespace update_client
 
 #endif  // COMPONENTS_UPDATE_CLIENT_TEST_INSTALLER_H_