Parse /etc/lsb-release only once on ChromeOS

chrome/browser/chromeos/system/statistics_provider.h

 // Copyright (c) 2011 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_BROWSER_CHROMEOS_SYSTEM_STATISTICS_PROVIDER_H_
 #define CHROME_BROWSER_CHROMEOS_SYSTEM_STATISTICS_PROVIDER_H_
 
 #include <string>
 
 namespace chromeos {
 namespace system {
 
 // Developer switch value.
 extern const char kDevSwitchBootMode[];
 
 // HWID key.
 extern const char kHardwareClass[];
 
-// Machine board key.
-extern const char kMachineInfoBoard[];
-
 // OEM customization flag that permits exiting enterprise enrollment flow in
 // OOBE when 'oem_enterprise_managed' flag is set.
 extern const char kOemCanExitEnterpriseEnrollmentKey[];
 
 // OEM customization directive that specified intended device purpose.
 extern const char kOemDeviceRequisitionKey[];
 
 // OEM customization flag that enforces enterprise enrollment flow in OOBE.
 extern const char kOemIsEnterpriseManagedKey[];
 
@@ skipping 32 matching lines @@
   static StatisticsProvider* GetInstance();
 
  protected:
   virtual ~StatisticsProvider() {}
 };
 
 }  // namespace system
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_SYSTEM_STATISTICS_PROVIDER_H_