fix minor style nit

chrome/app/google_update_client.cc

 // Copyright (c) 2006-2008 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.
 
 #include "chrome/app/google_update_client.h"
 
 #include <shlobj.h>
 #include <strsafe.h>
 
 #include "chrome/app/client_util.h"
@@ skipping 99 matching lines @@
                               const wchar_t* client_dll) {
   client_util::GetExecutablePath(dll_path_);
   guid_.assign(client_guid);
   dll_.assign(client_dll);
   bool ret = false;
   if (!guid_.empty()) {
     if (GoogleUpdateEnvQueryStr(kEnvProductVersionKey, &version_)) {
       ret = true;
     } else {
       std::wstring key(google_update::kRegPathClients);
-      key.append(L"\\");
-      key.append(guid_);
+      key.append(L"\\" + guid_);
       if (client_util::GetChromiumVersion(dll_path_, key.c_str(), &version_))
         ret = true;
     }
   }
 
   if (version_) {
     ::StringCchCat(dll_path_, MAX_PATH, version_);
   }
   return ret;
 }
 }  // namespace google_update
-