PART2: Make SignedSettings use proper Value types instead of string all around the place.

chrome/browser/chromeos/proxy_config_service_impl.cc

Index: chrome/browser/chromeos/proxy_config_service_impl.cc
diff --git a/chrome/browser/chromeos/proxy_config_service_impl.cc b/chrome/browser/chromeos/proxy_config_service_impl.cc
index 399965d0f7421a6a7da0145cd7826b81977b2520..bfa7f9b0276ac146b77d59edfc8bb40d052269d2 100644
--- a/chrome/browser/chromeos/proxy_config_service_impl.cc
+++ b/chrome/browser/chromeos/proxy_config_service_impl.cc
@@ -656,16 +656,19 @@ net::ProxyConfigService::ConfigAvailability
 
 void ProxyConfigServiceImpl::OnSettingsOpCompleted(
     SignedSettings::ReturnCode code,
-    std::string value) {
+    const base::Value& value) {
   retrieve_property_op_ = NULL;
   if (code != SignedSettings::SUCCESS) {
     LOG(WARNING) << "Error retrieving proxy setting from device";
     device_config_.clear();
     return;
   }
-  VLOG(1) << "Retrieved proxy setting from device, value=[" << value << "]";
+  std::string policy_value;
+  value.GetAsString(&policy_value);
+  VLOG(1) << "Retrieved proxy setting from device, value=["
+          << policy_value << "]";
   ProxyConfig device_config;
-  if (!device_config.DeserializeForDevice(value) ||
+  if (!device_config.DeserializeForDevice(policy_value) ||
       !device_config.SerializeForNetwork(&device_config_)) {
     LOG(WARNING) << "Can't deserialize device setting or serialize for network";
     device_config_.clear();