Fixit: Remove bunch of coverity warnings from chrome/installer/*.

chrome/installer/util/create_reg_key_work_item.cc

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2009 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 "shlwapi.h"
 
 #include "base/file_util.h"
 #include "base/registry.h"
 #include "chrome/installer/util/create_reg_key_work_item.h"
 #include "chrome/installer/util/install_util.h"
 #include "chrome/installer/util/logging_installer.h"
 
 CreateRegKeyWorkItem::~CreateRegKeyWorkItem() {
 }
 
 CreateRegKeyWorkItem::CreateRegKeyWorkItem(HKEY predefined_root,
-                                           std::wstring path)
+                                           const std::wstring& path)
     : predefined_root_(predefined_root),
       path_(path),
       key_created_(false) {
 }
 
 bool CreateRegKeyWorkItem::Do() {
   if(!InitKeyList()) {
     // Nothing needs to be done here.
     LOG(INFO) << "no key to create";
     return true;
@@ skipping 68 matching lines @@
 
   do {
     key_list_.push_back(key_path);
     // This is pure string operation so it does not matter whether the
     // path is file path or registry path.
     file_util::UpOneDirectoryOrEmpty(&key_path);
   } while(!key_path.empty());
 
   return true;
 }