Cleanup of system settings constants (ab)use.

chrome/browser/chromeos/extensions/info_private_api.cc

Index: chrome/browser/chromeos/extensions/info_private_api.cc
diff --git a/chrome/browser/chromeos/extensions/info_private_api.cc b/chrome/browser/chromeos/extensions/info_private_api.cc
index 872d7902814dac34dfa228401ecd752ada86c1d2..b8ab124e9222166912aac9cda99069f5a3886d8c 100644
--- a/chrome/browser/chromeos/extensions/info_private_api.cc
+++ b/chrome/browser/chromeos/extensions/info_private_api.cc
@@ -18,9 +18,6 @@ namespace extensions {
 
 namespace {
 
-// Name of machine statistic property with HWID.
-const char kHardwareClass[] = "hardware_class";
-
 // Key which corresponds to the HWID setting.
 const char kPropertyHWID[] = "hwid";
 
@@ -69,7 +66,7 @@ base::Value* ChromeosInfoPrivateGetFunction::GetValue(
     std::string hwid;
     chromeos::system::StatisticsProvider* provider =
         chromeos::system::StatisticsProvider::GetInstance();
-    provider->GetMachineStatistic(kHardwareClass, &hwid);
+    provider->GetMachineStatistic(chromeos::system::kHardwareClass, &hwid);
     return new base::StringValue(hwid);
   } else if (property_name == kPropertyHomeProvider) {
     NetworkLibrary* netlib = CrosLibrary::Get()->GetNetworkLibrary();
@@ -81,7 +78,7 @@ base::Value* ChromeosInfoPrivateGetFunction::GetValue(
     std::string board;
     chromeos::system::StatisticsProvider* provider =
         chromeos::system::StatisticsProvider::GetInstance();
-    provider->GetMachineStatistic(kPropertyReleaseBoard, &board);
+    provider->GetMachineStatistic(chromeos::system::kMachineInfoBoard, &board);
     return new base::StringValue(board);
   } else if (property_name == kPropertyOwner) {
     return Value::CreateBooleanValue(