Clean up handling of invalid HWID when running ChromeOS in VMs

chromeos/system/fake_statistics_provider.cc

 // Copyright 2014 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/fake_statistics_provider.h"
 
 namespace chromeos {
 namespace system {
 
 FakeStatisticsProvider::FakeStatisticsProvider() {
@@ skipping 20 matching lines @@
                                             bool* result) {
   std::map<std::string, bool>::const_iterator match = machine_flags_.find(name);
   if (match != machine_flags_.end() && result)
     *result = match->second;
   return match != machine_flags_.end();
 }
 
 void FakeStatisticsProvider::Shutdown() {
 }
 
+bool FakeStatisticsProvider::IsRunningOnVm() {
+  std::string is_vm;
+  return GetMachineStatistic(kIsVmKey, &is_vm) && is_vm == kIsVmValueTrue;
+}
+
+
 void FakeStatisticsProvider::SetMachineStatistic(const std::string& key,
                                                  const std::string& value) {
   machine_statistics_[key] = value;
 }
 
 void FakeStatisticsProvider::ClearMachineStatistic(const std::string& key) {
   machine_statistics_.erase(key);
 }
 
 void FakeStatisticsProvider::SetMachineFlag(const std::string& key,
                                             bool value) {
   machine_flags_[key] = value;
 }
 
 void FakeStatisticsProvider::ClearMachineFlag(const std::string& key) {
   machine_flags_.erase(key);
 }
 
 ScopedFakeStatisticsProvider::ScopedFakeStatisticsProvider() {
   StatisticsProvider::SetTestProvider(this);
 }
 
 ScopedFakeStatisticsProvider::~ScopedFakeStatisticsProvider() {
   StatisticsProvider::SetTestProvider(NULL);
 }
 
 }  // namespace system
 }  // namespace chromeos