Implement PermissionService::GetNextPermissionChange.

content/public/browser/content_browser_client.cc

Index: content/public/browser/content_browser_client.cc
diff --git a/content/public/browser/content_browser_client.cc b/content/public/browser/content_browser_client.cc
index 96c076a602de161ea5e0fb2a3a789d3ab8d9e315..71cc0fb2b47c314dadffc0ab3e3f71c41a535bfe 100644
--- a/content/public/browser/content_browser_client.cc
+++ b/content/public/browser/content_browser_client.cc
@@ -242,6 +242,15 @@ PermissionStatus ContentBrowserClient::GetPermissionStatus(
   return PERMISSION_STATUS_DENIED;
 }
 
+int ContentBrowserClient::SubscribePermissionStatusChange(
+    PermissionType permission,
+    BrowserContext* browser_context,
+    const GURL& requesting_origin,
+    const GURL& embedding_origin,
+    const base::Callback<void(PermissionStatus)>& callback) {
+  return 0;
+}
+
 bool ContentBrowserClient::CanCreateWindow(
     const GURL& opener_url,
     const GURL& opener_top_level_frame_url,