Clean up the unpack directory for CRLSet component.

ios/chrome/browser/net/crl_set_fetcher.cc

Index: ios/chrome/browser/net/crl_set_fetcher.cc
diff --git a/ios/chrome/browser/net/crl_set_fetcher.cc b/ios/chrome/browser/net/crl_set_fetcher.cc
index dd75b215a7eff001421212ddd6862c7d8ace8acc..92966ca6f3860785d93f0069af651253558d7406 100644
--- a/ios/chrome/browser/net/crl_set_fetcher.cc
+++ b/ios/chrome/browser/net/crl_set_fetcher.cc
@@ -163,9 +163,11 @@ void CRLSetFetcher::OnUpdateError(int error) {
 update_client::CrxInstaller::Result CRLSetFetcher::Install(
     const base::DictionaryValue& manifest,
     const base::FilePath& unpack_path) {
-  return update_client::InstallFunctionWrapper(
+  const auto result = update_client::InstallFunctionWrapper(
       base::Bind(&CRLSetFetcher::DoInstall, base::Unretained(this),
                  base::ConstRef(manifest), base::ConstRef(unpack_path)));
+  base::DeleteFile(unpack_path, true /* recursive */);
+  return result;
 }
 
 bool CRLSetFetcher::DoInstall(const base::DictionaryValue& manifest,