Implement PermissionService::GetNextPermissionChange.

chromecast/browser/cast_permission_manager.cc

Index: chromecast/browser/cast_permission_manager.cc
diff --git a/chromecast/browser/cast_permission_manager.cc b/chromecast/browser/cast_permission_manager.cc
index 0ed57c84648baa17f8f84d6ebae39618192fbbb8..54352c0db790681744ece841ab05da7a810ab02b 100644
--- a/chromecast/browser/cast_permission_manager.cc
+++ b/chromecast/browser/cast_permission_manager.cc
@@ -56,5 +56,17 @@ void CastPermissionManager::RegisterPermissionUsage(
     const GURL& embedding_origin) {
 }
 
+int CastPermissionManager::SubscribePermissionStatusChange(
+    content::PermissionType permission,
+    const GURL& requesting_origin,
+    const GURL& embedding_origin,
+    const base::Callback<void(content::PermissionStatus)>& callback) {
+  return -1;
+}
+
+void CastPermissionManager::UnsubscribePermissionStatusChange(
+    int subscription_id) {
+}
+
 }  // namespace shell
 }  // namespace chromecast