Implement PermissionService::GetNextPermissionChange.

content/shell/browser/shell_permission_manager.cc

Index: content/shell/browser/shell_permission_manager.cc
diff --git a/content/shell/browser/shell_permission_manager.cc b/content/shell/browser/shell_permission_manager.cc
index 609622ba3427876b6a494ed33b01baf7f6e27238..1050e63dc7489913f743bd02ab1d106503d04962 100644
--- a/content/shell/browser/shell_permission_manager.cc
+++ b/content/shell/browser/shell_permission_manager.cc
@@ -53,4 +53,16 @@ void ShellPermissionManager::RegisterPermissionUsage(
     const GURL& embedding_origin) {
 }
 
+int ShellPermissionManager::SubscribePermissionStatusChange(
+    PermissionType permission,
+    const GURL& requesting_origin,
+    const GURL& embedding_origin,
+    const base::Callback<void(PermissionStatus)>& callback) {
+  return -1;
+}
+
+void ShellPermissionManager::UnsubscribePermissionStatusChange(
+    int subscription_id) {
+}
+
 }  // namespace content