ABANDONED: chromeos: Remove spammy "Failed to get machine id" warning.

chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos.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_BROWSER_CHROMEOS_POLICY_DEVICE_CLOUD_POLICY_MANAGER_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_CLOUD_POLICY_MANAGER_CHROMEOS_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 67 matching lines @@
 
   // If set, the device will start the enterprise enrollment OOBE.
   void SetDeviceEnrollmentAutoStart();
 
   // CloudPolicyManager:
   void Shutdown() override;
 
   // Pref registration helper.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
-  // Returns the device serial number, or an empty string if not available.
+  // Returns the device serial number, or an empty string if unavailable
+  // (possibly due to the device having already been enrolled or claimed by a
+  // local user).
   static std::string GetMachineID();
 
   // Returns the machine model, or an empty string if not available.
   static std::string GetMachineModel();
 
   // Returns the mode for using zero-touch enrollment.
   static ZeroTouchEnrollmentMode GetZeroTouchEnrollmentMode();
 
   // Returns the robot 'email address' associated with the device robot
   // account (sometimes called a service account) associated with this device
@@ skipping 60 matching lines @@
       attestation_policy_observer_;
 
   base::ObserverList<Observer, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceCloudPolicyManagerChromeOS);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_CLOUD_POLICY_MANAGER_CHROMEOS_H_