Make GetCommandExecuteImplClsid return the CLSID as a string directly.

chrome/installer/util/google_chrome_sxs_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.
 
 #ifndef CHROME_INSTALLER_UTIL_GOOGLE_CHROME_SXS_DISTRIBUTION_H_
 #define CHROME_INSTALLER_UTIL_GOOGLE_CHROME_SXS_DISTRIBUTION_H_
 
 #include "base/strings/string16.h"
 #include "chrome/installer/util/browser_distribution.h"
 #include "chrome/installer/util/google_chrome_distribution.h"
@@ skipping 13 matching lines @@
   int GetIconIndex(ShortcutType shortcut_type) override;
   base::string16 GetStartMenuShortcutSubfolder(
       Subfolder subfolder_type) override;
   base::string16 GetBaseAppId() override;
   base::string16 GetBrowserProgIdPrefix() override;
   base::string16 GetBrowserProgIdDesc() override;
   base::string16 GetInstallSubDir() override;
   base::string16 GetUninstallRegPath() override;
   DefaultBrowserControlPolicy GetDefaultBrowserControlPolicy() override;
   bool GetChromeChannel(base::string16* channel) override;
-  bool GetCommandExecuteImplClsid(base::string16* handler_class_uuid) override;
+  base::string16 GetCommandExecuteImplClsid() override;
   bool ShouldSetExperimentLabels() override;
   bool HasUserExperiments() override;
   // returns the channel name for GoogleChromeSxSDistribution
   static base::string16 ChannelName();
  private:
   friend class BrowserDistribution;
 
   // Disallow construction from non-friends.
   GoogleChromeSxSDistribution();
 };
 
 #endif  // CHROME_INSTALLER_UTIL_GOOGLE_CHROME_SXS_DISTRIBUTION_H_