diff --git a/content/browser/webui/web_ui_message_handler.cc b/content/browser/webui/web_ui_message_handler.cc
index 8c88995877d5..3836e5600912 100644
--- a/content/browser/webui/web_ui_message_handler.cc
+++ b/content/browser/webui/web_ui_message_handler.cc
@@ -89,4 +89,12 @@ void WebUIMessageHandler::RejectJavascriptCallback(
                          response);
 }

+template <typename... Values>
+void WebUIMessageHandler::FireWebUIListener(const std::string& event_name,
+                                            const Values&... values) {
+  // cr.webUIListenerCallback is a global JS function exposed from cr.js.
+  CallJavascriptFunction("cr.webUIListenerCallback", base::Value(event_name),
+                         values...);
+}
+
 }  // namespace content
diff --git a/content/public/browser/web_ui_message_handler.h b/content/public/browser/web_ui_message_handler.h
index 0582651ce4a7..10f2d70c275f 100644
--- a/content/public/browser/web_ui_message_handler.h
+++ b/content/public/browser/web_ui_message_handler.h
@@ -95,11 +95,7 @@ class CONTENT_EXPORT WebUIMessageHandler {
   // cr.addWebUIListener() (defined in cr.js).
   template <typename... Values>
   void FireWebUIListener(const std::string& event_name,
-                         const Values&... values) {
-    // cr.webUIListenerCallback is a global JS function exposed from cr.js.
-    CallJavascriptFunction("cr.webUIListenerCallback", base::Value(event_name),
-                           values...);
-  }
+                         const Values&... values);

   // Call a Javascript function by sending its name and arguments down to
   // the renderer.  This is asynchronous; there's no way to get the result