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

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 a423aaed70ccd5234a6ca2e29bce56d7e5f9abc2..56e1623201a6e2687c88c94c0ca1133eabd70b91 100644
--- a/chrome/browser/chromeos/login/signed_settings.h
+++ b/chrome/browser/chromeos/login/signed_settings.h
@@ -9,6 +9,7 @@
 #include <string>
 #include <vector>
 
+#include "base/values.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/chromeos/login/owner_manager.h"
 
@@ -74,12 +75,12 @@ class SignedSettings : public base::RefCountedThreadSafe<SignedSettings>,
   // one type can be in flight at a time.
   static SignedSettings* CreateStorePropertyOp(
       const std::string& name,
-      const std::string& value,
+      const base::Value& value,
       SignedSettings::Delegate<bool>* d);
 
   static SignedSettings* CreateRetrievePropertyOp(
       const std::string& name,
-      SignedSettings::Delegate<std::string>* d);
+      SignedSettings::Delegate<const base::Value&>* d);
 
   // These are both "policy" operations, and only one instance of
   // one type can be in flight at a time.