Plugin Power Saver: Make PPS work well with prerendered pages.

chrome/renderer/plugins/chrome_plugin_placeholder.h

Index: chrome/renderer/plugins/chrome_plugin_placeholder.h
diff --git a/chrome/renderer/plugins/chrome_plugin_placeholder.h b/chrome/renderer/plugins/chrome_plugin_placeholder.h
index bdcf02ccba26d374c10d5af7d24aee0e3da5f063..d5fb2f9406d7554c85c870c47492d3e6fc42ce78 100644
--- a/chrome/renderer/plugins/chrome_plugin_placeholder.h
+++ b/chrome/renderer/plugins/chrome_plugin_placeholder.h
@@ -69,6 +69,9 @@ class ChromePluginPlaceholder : public plugins::LoadablePluginPlaceholder,
                           const base::string16& title);
   ~ChromePluginPlaceholder() override;
 
+  // content::LoadablePluginPlaceholder method
+  blink::WebPlugin* CreatePlugin() override;
+
   // gin::Wrappable (via PluginPlaceholder) method
   gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
       v8::Isolate* isolate) override;