Make GetCommandExecuteImplClsid return the CLSID as a string directly.

chrome/installer/util/google_chrome_distribution.h

 // Copyright (c) 2012 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.
 //
 // This file extends generic BrowserDistribution class to declare Google Chrome
 // specific implementation.
 
 #ifndef CHROME_INSTALLER_UTIL_GOOGLE_CHROME_DISTRIBUTION_H_
 #define CHROME_INSTALLER_UTIL_GOOGLE_CHROME_DISTRIBUTION_H_
 
@@ skipping 47 matching lines @@
 
   std::string GetSafeBrowsingName() override;
 
   // This method reads data from the Google Update ClientState key for
   // potential use in the uninstall survey. It must be called before the
   // key returned by GetVersionKey() is deleted.
   base::string16 GetDistributionData(HKEY root_key) override;
 
   base::string16 GetUninstallRegPath() override;
 
-  bool GetCommandExecuteImplClsid(base::string16* handler_class_uuid) override;
+  base::string16 GetCommandExecuteImplClsid() override;
 
   void UpdateInstallStatus(
       bool system_install,
       installer::ArchiveType archive_type,
       installer::InstallStatus install_status) override;
 
   bool ShouldSetExperimentLabels() override;
 
   bool HasUserExperiments() override;
 
  protected:
   // Disallow construction from others.
   GoogleChromeDistribution();
 
   explicit GoogleChromeDistribution(
       scoped_ptr<AppRegistrationData> app_reg_data);
 
  private:
   friend class BrowserDistribution;
 };
 
 #endif  // CHROME_INSTALLER_UTIL_GOOGLE_CHROME_DISTRIBUTION_H_