Unconditionally delete the unpack path in the UpdateClient.

components/update_client/component.cc

Index: components/update_client/component.cc
diff --git a/components/update_client/component.cc b/components/update_client/component.cc
index dec191d487418503e62728a4f09d6bfe48004487..a63b5cdc6800fdaccc4d0ffb484efca9d5852a78 100644
--- a/components/update_client/component.cc
+++ b/components/update_client/component.cc
@@ -95,9 +95,11 @@ void InstallOnBlockingTaskRunner(
     InstallOnBlockingTaskRunnerCompleteCallback callback) {
   DCHECK(blocking_task_runner->RunsTasksOnCurrentThread());
 
+  DCHECK(base::DirectoryExists(unpack_path));
   const auto result = DoInstallOnBlockingTaskRunner(
       main_task_runner, blocking_task_runner, unpack_path, fingerprint,
       installer, callback);
+  base::DeleteFile(unpack_path, true);
 
   const ErrorCategory error_category =
       result.error ? ErrorCategory::kInstallError : ErrorCategory::kErrorNone;