Fix a signed settings serialization issue.

chrome/browser/chromeos/device_settings_provider.cc

Index: chrome/browser/chromeos/device_settings_provider.cc
diff --git a/chrome/browser/chromeos/device_settings_provider.cc b/chrome/browser/chromeos/device_settings_provider.cc
index d04c4fb5c851fe4ba69815ad4cb26cdbe3fe9a9c..15037a33574bf11903b9925d13f0ba29afa5e8e2 100644
--- a/chrome/browser/chromeos/device_settings_provider.cc
+++ b/chrome/browser/chromeos/device_settings_provider.cc
@@ -300,6 +300,10 @@ void DeviceSettingsProvider::FinishSetInPolicy(
     Reload();
     return;
   }
+  // Update the internal caches and set the trusted flag to true so that we
+  // can pass the trustedness check in the second call to SetInPolicy.
+  OnRetrievePolicyCompleted(code, policy);
+
   SetInPolicy(prop, *value);
 }