Add getGlobalPolicy to networkingPrivate API.

extensions/browser/api/networking_private/networking_private_linux.h

Index: extensions/browser/api/networking_private/networking_private_linux.h
diff --git a/extensions/browser/api/networking_private/networking_private_linux.h b/extensions/browser/api/networking_private/networking_private_linux.h
index 6d69d97b9049aa5b14b9dbb96963cd405f91371c..1f398f6d024a22e559ec4a4f637c91907a5677f9 100644
--- a/extensions/browser/api/networking_private/networking_private_linux.h
+++ b/extensions/browser/api/networking_private/networking_private_linux.h
@@ -91,9 +91,9 @@ class NetworkingPrivateLinux : public NetworkingPrivateDelegate {
                            const std::string& new_pin,
                            const VoidCallback& success_callback,
                            const FailureCallback& failure_callback) override;
-
   std::unique_ptr<base::ListValue> GetEnabledNetworkTypes() override;
   std::unique_ptr<DeviceStateList> GetDeviceStateList() override;
+  std::unique_ptr<base::DictionaryValue> GetGlobalPolicy() override;
   bool EnableNetworkType(const std::string& type) override;
   bool DisableNetworkType(const std::string& type) override;
   bool RequestScan() override;