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

chrome/installer/util/set_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_SET_REG_VALUE_WORK_ITEM_H__
 #define CHROME_INSTALLER_UTIL_SET_REG_VALUE_WORK_ITEM_H__
 
 #include <string>
 #include <windows.h>
 #include "chrome/installer/util/work_item.h"
 
@@ skipping 19 matching lines @@
     // been overwritten.
     VALUE_OVERWRITTEN,
     // One possible outcome after Do(). No change is applied, either
     // because we are not allowed to overwrite the previous value, or due to
     // some errors like the key does not exist.
     VALUE_UNCHANGED,
     // The status after Do and Rollback is called.
     VALUE_ROLL_BACK
   };
 
-  SetRegValueWorkItem(HKEY predefined_root, std::wstring key_path,
-                      std::wstring value_name, std::wstring value_data,
+  SetRegValueWorkItem(HKEY predefined_root,
+                      const std::wstring& key_path,
+                      const std::wstring& value_name,
+                      const std::wstring& value_data,
                       bool overwrite);
 
-  SetRegValueWorkItem(HKEY predefined_root, std::wstring key_path,
-                      std::wstring value_name, DWORD value_data,
+  SetRegValueWorkItem(HKEY predefined_root, const std::wstring& key_path,
+                      const std::wstring& value_name, DWORD value_data,
                       bool overwrite);
 
   // 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.
@@ skipping 10 matching lines @@
   bool is_str_type_;
 
   SettingStatus status_;
 
   // Data of the previous value.
   std::wstring previous_value_str_;  // if data is of type REG_SZ
   DWORD previous_value_dword_;  // if data is of type REG_DWORD
 };
 
 #endif  // CHROME_INSTALLER_UTIL_SET_REG_VALUE_WORK_ITEM_H__