Clean up Chrome OS WARNING spam

chromeos/system/statistics_provider.cc

 // Copyright 2013 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.
 
 #include "chromeos/system/statistics_provider.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/location.h"
@@ skipping 23 matching lines @@
 const char kCrosSystemEq[] = "=";
 const char kCrosSystemDelim[] = "\n";
 const char kCrosSystemCommentDelim[] = "#";
 const char kCrosSystemUnknownValue[] = "(error)";
 
 const char kHardwareClassCrosSystemKey[] = "hwid";
 const char kUnknownHardwareClass[] = "unknown";
 const char kSerialNumber[] = "sn";
 
 // File to get machine hardware info from, and key/value delimiters of
-// the file.
-// /tmp/machine-info is generated by platform/init/chromeos_startup.
+// the file. machine-info is generated only for OOBE and enterprise enrollment
+// and may not be present. See login-manager/init/machine-info.conf.
 const char kMachineHardwareInfoFile[] = "/tmp/machine-info";
 const char kMachineHardwareInfoEq[] = "=";
 const char kMachineHardwareInfoDelim[] = " \n";
 
 // File to get ECHO coupon info from, and key/value delimiters of
 // the file.
 const char kEchoCouponFile[] = "/var/cache/echo/vpd_echo.txt";
 const char kEchoCouponEq[] = "=";
 const char kEchoCouponDelim[] = "\n";
 
@@ skipping 267 matching lines @@
   return StatisticsProviderImpl::GetInstance();
 }
 
 // static
 void StatisticsProvider::SetTestProvider(StatisticsProvider* test_provider) {
   g_test_statistics_provider = test_provider;
 }
 
 }  // namespace system
 }  // namespace chromeos