Implement new network change notifier that uses NetworkStateHandler

chromeos/network/managed_state.h

Index: chromeos/network/managed_state.h
diff --git a/chromeos/network/managed_state.h b/chromeos/network/managed_state.h
index 0138df6484543d230e3b07a1984bc17258e0c2e4..4a6675a3590e37d6b4f6c03993acb227d8fd6bf1 100644
--- a/chromeos/network/managed_state.h
+++ b/chromeos/network/managed_state.h
@@ -11,6 +11,10 @@
 #include "base/compiler_specific.h"
 #include "chromeos/chromeos_export.h"
 
+namespace net {
+class NetworkChangeNotifierChromeosUpdateTest;
+}
+
 namespace base {
 class Value;
 }
@@ -71,6 +75,8 @@ class ManagedState {
                       std::string* out_value);
 
  private:
+  friend class NetworkChangeNotifierChromeosUpdateTest;
+
   ManagedType managed_type_;
 
   // The path (e.g. service path or device path) of the managed state object.