Show a replacement plug-in for loading errors.

content/shell/shell_content_renderer_client.h

Index: content/shell/shell_content_renderer_client.h
diff --git a/content/shell/shell_content_renderer_client.h b/content/shell/shell_content_renderer_client.h
index a28f4f0de86c89fd247c4e05db05cef4458006a5..06828ab2ca078faf4f34c7f40decd9cccb464859 100644
--- a/content/shell/shell_content_renderer_client.h
+++ b/content/shell/shell_content_renderer_client.h
@@ -28,6 +28,9 @@ class ShellContentRendererClient : public ContentRendererClient {
       WebKit::WebFrame* frame,
       const WebKit::WebPluginParams& params,
       WebKit::WebPlugin** plugin) OVERRIDE;
+  virtual WebKit::WebPlugin* CreatePluginReplacement(
+      RenderView* render_view,
+      const FilePath& plugin_path) OVERRIDE;
   virtual bool HasErrorPage(int http_status_code,
                             std::string* error_domain) OVERRIDE;
   virtual void GetNavigationErrorStrings(