Make GetCommandExecuteImplClsid return the CLSID as a string directly.

chrome/installer/util/chromium_binaries_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 declares a class that contains various method related to branding.
 
 #ifndef CHROME_INSTALLER_UTIL_CHROMIUM_BINARIES_DISTRIBUTION_H_
 #define CHROME_INSTALLER_UTIL_CHROMIUM_BINARIES_DISTRIBUTION_H_
 
 #include <string>
@@ skipping 26 matching lines @@
   base::string16 GetLongAppDescription() override;
 
   std::string GetSafeBrowsingName() 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;
 
  protected:
   friend class BrowserDistribution;
 
   ChromiumBinariesDistribution();
 
   explicit ChromiumBinariesDistribution(
       scoped_ptr<AppRegistrationData> app_reg_data);
 
   BrowserDistribution* browser_distribution_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ChromiumBinariesDistribution);
 };
 
 #endif  // CHROME_INSTALLER_UTIL_CHROMIUM_BINARIES_DISTRIBUTION_H_