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

chrome/browser/chromeos/proxy_config_service_impl.h

Index: chrome/browser/chromeos/proxy_config_service_impl.h
diff --git a/chrome/browser/chromeos/proxy_config_service_impl.h b/chrome/browser/chromeos/proxy_config_service_impl.h
index fc0109fcb71d6e4108e80295ba76618519402f8e..4b46a9797b445e1180da4dea2e32977755bbafc9 100644
--- a/chrome/browser/chromeos/proxy_config_service_impl.h
+++ b/chrome/browser/chromeos/proxy_config_service_impl.h
@@ -35,7 +35,7 @@ namespace chromeos {
 //   any network (either currently active or non-active) on UI thread
 class ProxyConfigServiceImpl
     : public base::RefCountedThreadSafe<ProxyConfigServiceImpl>,
-      public SignedSettings::Delegate<std::string>,
+      public SignedSettings::Delegate<const base::Value&>,
       public NetworkLibrary::NetworkManagerObserver,
       public NetworkLibrary::NetworkObserver {
  public:
@@ -232,13 +232,14 @@ class ProxyConfigServiceImpl
 
   // Implementation for SignedSettings::Delegate
   virtual void OnSettingsOpCompleted(SignedSettings::ReturnCode code,
-                                     std::string value);
+                                     const base::Value& value) OVERRIDE;
 
   // NetworkLibrary::NetworkManagerObserver implementation.
-  virtual void OnNetworkManagerChanged(NetworkLibrary* cros);
+  virtual void OnNetworkManagerChanged(NetworkLibrary* cros) OVERRIDE;
 
   // NetworkLibrary::NetworkObserver implementation.
-  virtual void OnNetworkChanged(NetworkLibrary* cros, const Network* network);
+  virtual void OnNetworkChanged(NetworkLibrary* cros,
+                                const Network* network) OVERRIDE;
 
 #if defined(UNIT_TEST)
   void SetTesting() {