WebUI: Fix lifecycle-bug when RenderFrameHost is swapped out

content/browser/webui/web_ui_impl.cc

Index: content/browser/webui/web_ui_impl.cc
diff --git a/content/browser/webui/web_ui_impl.cc b/content/browser/webui/web_ui_impl.cc
index 41fc037852c786645705881beed7ad9ca6d0e0fa..75779428e985c3d154fc8dad974475ee78a4f8d4 100644
--- a/content/browser/webui/web_ui_impl.cc
+++ b/content/browser/webui/web_ui_impl.cc
@@ -100,6 +100,11 @@ void WebUIImpl::RenderViewReused(RenderViewHost* render_view_host,
     handler->RenderViewReused();
 }
 
+void WebUIImpl::RenderFrameHostSwappingOut() {
+  for (WebUIMessageHandler* handler : handlers_)
+    handler->DisallowJavascript();
+}
+
 WebContents* WebUIImpl::GetWebContents() const {
   return web_contents_;
 }