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

chrome/installer/util/delete_reg_value_work_item.h

-// 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.
 
 #ifndef CHROME_INSTALLER_UTIL_DELETE_REG_VALUE_WORK_ITEM_H_
 #define CHROME_INSTALLER_UTIL_DELETE_REG_VALUE_WORK_ITEM_H_
 
 #include <string>
 #include <windows.h>
 #include "chrome/installer/util/work_item.h"
 
@@ skipping 16 matching lines @@
     // One possible outcome after Do(). Value is deleted.
     VALUE_DELETED,
     // One possible outcome after Do(). Value is not found.
     VALUE_NOT_FOUND,
     // The status after Do() and Rollback() is called.
     VALUE_ROLLED_BACK,
     // Another possible outcome after Do() (when there is an error).
     VALUE_UNCHANGED
   };
 
-  DeleteRegValueWorkItem(HKEY predefined_root, std::wstring key_path,
-                         std::wstring value_name, bool is_str_type);
+  DeleteRegValueWorkItem(HKEY predefined_root, const std::wstring& key_path,
+                         const std::wstring& value_name, bool is_str_type);
 
   // Root key of the target key under which the value is set. The root key can
   // only be one of the predefined keys on Windows.
   HKEY predefined_root_;
 
   // Path of the target key under which the value is set.
   std::wstring key_path_;
 
   // Name of the value to be set.
   std::wstring value_name_;
 
   // boolean that tells whether data value is of type REG_SZ or REG_DWORD.
   // Ideally we do not need this information from user of this class and can
   // check the registry for the type. But to simpify implementation we are
   // going to put the burden on the caller for now to provide us the type.
   bool is_str_type_;
 
   DeletionStatus status_;
 
   // Data of the previous value.
   std::wstring old_str_;  // if data is of type REG_SZ
   DWORD old_dw_;  // if data is of type REG_DWORD
 };
 
 #endif  // CHROME_INSTALLER_UTIL_DELETE_REG_VALUE_WORK_ITEM_H_