Prevent a DCHECK when starting a chromeos=1 build with --stub-cros-settings.

chrome/browser/chromeos/settings/device_settings_provider.cc

Index: chrome/browser/chromeos/settings/device_settings_provider.cc
diff --git a/chrome/browser/chromeos/settings/device_settings_provider.cc b/chrome/browser/chromeos/settings/device_settings_provider.cc
index 8f662117e586701cbb76656bfd5eff0a1ed84326..8a1e26055e984a9b83b2e26e1d74f68543893032 100644
--- a/chrome/browser/chromeos/settings/device_settings_provider.cc
+++ b/chrome/browser/chromeos/settings/device_settings_provider.cc
@@ -36,6 +36,9 @@ namespace chromeos {
 
 namespace {
 
+// Legacy policy file location. Used to detect migration from pre v12 ChromeOS.
+const char kLegacyPolicyFile[] = "/var/lib/whitelist/preferences";
+
 // List of settings handled by the DeviceSettingsProvider.
 const char* kKnownSettings[] = {
   kAccountsPrefAllowGuest,
@@ -64,12 +67,18 @@ const char* kKnownSettings[] = {
   kSystemTimezonePolicy,
 };
 
-// Legacy policy file location. Used to detect migration from pre v12 ChromeOS.
-const char kLegacyPolicyFile[] = "/var/lib/whitelist/preferences";
+}  // namespace
+
+const char** DeviceSettingsProvider::kKnownSettingsBegin = kKnownSettings;
+const char** DeviceSettingsProvider::kKnownSettingsEnd =
+    kKnownSettings + arraysize(kKnownSettings);
+
+namespace {
 
 bool IsControlledSetting(const std::string& pref_path) {
-  const char** end = kKnownSettings + arraysize(kKnownSettings);
-  return std::find(kKnownSettings, end, pref_path) != end;
+  static const char** begin = DeviceSettingsProvider::kKnownSettingsBegin;
+  static const char** end = DeviceSettingsProvider::kKnownSettingsEnd;
+  return std::find(begin, end, pref_path) != end;
 }
 
 bool HasOldMetricsFile() {