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

chrome/browser/chromeos/cros_settings.h

Index: chrome/browser/chromeos/cros_settings.h
diff --git a/chrome/browser/chromeos/cros_settings.h b/chrome/browser/chromeos/cros_settings.h
index efa283f2d0f32d09a8d8c2d26e16de4611a18cbb..5411de2b1d53cb6ab82ec248683ea9088d183b2e 100644
--- a/chrome/browser/chromeos/cros_settings.h
+++ b/chrome/browser/chromeos/cros_settings.h
@@ -35,8 +35,7 @@ class CrosSettings : public base::NonThreadSafe {
   static bool IsCrosSettings(const std::string& path);
 
   // Sets |in_value| to given |path| in cros settings.
-  // Note that this takes ownership of |in_value|.
-  void Set(const std::string& path, base::Value* in_value);
+  void Set(const std::string& path, const base::Value& in_value);
 
   // Fires system setting change notification.
   // TODO(pastarmovj): Consider to remove this function from the public
@@ -61,6 +60,10 @@ class CrosSettings : public base::NonThreadSafe {
   void SetDouble(const std::string& path, double in_value);
   void SetString(const std::string& path, const std::string& in_value);
 
+  // Convenience functions for manipulating lists.
+  void AppendToList(const std::string& path, const base::Value& value);
+  void RemoveFromList(const std::string& path, const base::Value& value);
+
   // These are convenience forms of Get().  The value will be retrieved
   // and the return value will be true if the path is valid and the value at
   // the end of the path can be returned in the form specified.