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

chrome/installer/util/version.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_VERSION_H__
-#define CHROME_INSTALLER_UTIL_VERSION_H__
+#ifndef CHROME_INSTALLER_UTIL_VERSION_H_
+#define CHROME_INSTALLER_UTIL_VERSION_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 
 namespace installer {
 
 class Version {
 public:
   virtual ~Version();
 
   // Check if the current version is higher than the version object passed
   // as parameter
   bool IsHigherThan(const Version* other) const;
 
   // Return the string representation of this version
   const std::wstring& GetString() const {
     return version_str_;
   }
 
   // Assume that the version string is specified by four integers separated
   // by character '.'. Return NULL if string is not of this format.
   // Caller is responsible for freeing the Version object once done.
-  static Version* GetVersionFromString(std::wstring version_str);
+  static Version* GetVersionFromString(const std::wstring& version_str);
 
 private:
   int64 major_;
   int64 minor_;
   int64 build_;
   int64 patch_;
   std::wstring version_str_;
 
   // Classes outside this file do not have any need to create objects of
   // this type so declare constructor as private.
   Version(int64 major, int64 minor, int64 build, int64 patch);
 };
 
 }  // namespace installer
 
 #endif