[Chrome OS] Plumb new error codes from SignedSettings to consumers of the API

chrome/browser/chromeos/login/signed_settings.h

Index: chrome/browser/chromeos/login/signed_settings.h
diff --git a/chrome/browser/chromeos/login/signed_settings.h b/chrome/browser/chromeos/login/signed_settings.h
index 69f2bd0ae347e2cd6e2bff87e4dbede84e8d99c4..61d5e15805e6571087bcd862f224fef37a676de4 100644
--- a/chrome/browser/chromeos/login/signed_settings.h
+++ b/chrome/browser/chromeos/login/signed_settings.h
@@ -35,7 +35,8 @@ class OwnershipService;
 class SignedSettings : public base::RefCountedThreadSafe<SignedSettings>,
                        public OwnerManager::Delegate {
  public:
-  enum FailureCode {
+  enum ReturnCode {
+    SUCCESS,
     NOT_FOUND,        // Email address or property name not found.
     KEY_UNAVAILABLE,  // Owner key not yet configured.
     OPERATION_FAILED  // Signature op or IPC to signed settings daemon failed.
@@ -44,9 +45,8 @@ class SignedSettings : public base::RefCountedThreadSafe<SignedSettings>,
   template <class T>
   class Delegate {
    public:
-    // These methods will be called on the UI thread.
-    virtual void OnSettingsOpSucceeded(T value) {}
-    virtual void OnSettingsOpFailed(FailureCode code) {}
+    // This method will be called on the UI thread.
+    virtual void OnSettingsOpCompleted(ReturnCode code, T value) {}
   };
 
   SignedSettings();
@@ -73,7 +73,7 @@ class SignedSettings : public base::RefCountedThreadSafe<SignedSettings>,
       const std::string& name,
       SignedSettings::Delegate<std::string>* d);
 
-  static FailureCode MapKeyOpCode(OwnerManager::KeyOpCode code);
+  static ReturnCode MapKeyOpCode(OwnerManager::KeyOpCode code);
 
   virtual void Execute() = 0;