Revert of Plugins: Remove Shadow DOM Plugin Placeholder

content/public/renderer/content_renderer_client.cc

Index: content/public/renderer/content_renderer_client.cc
diff --git a/content/public/renderer/content_renderer_client.cc b/content/public/renderer/content_renderer_client.cc
index f91d8c67a978d6ab85cf7d0dfbcde790448bc215..95133390b31da8e08a803fb906c090f13da3ce9e 100644
--- a/content/public/renderer/content_renderer_client.cc
+++ b/content/public/renderer/content_renderer_client.cc
@@ -7,6 +7,7 @@
 #include "content/public/renderer/media_stream_renderer_factory.h"
 #include "media/base/renderer_factory.h"
 #include "third_party/WebKit/public/platform/modules/app_banner/WebAppBannerClient.h"
+#include "third_party/WebKit/public/web/WebPluginPlaceholder.h"
 
 namespace content {
 
@@ -15,6 +16,14 @@
 }
 
 SkBitmap* ContentRendererClient::GetSadWebViewBitmap() {
+  return nullptr;
+}
+
+scoped_ptr<blink::WebPluginPlaceholder>
+ContentRendererClient::CreatePluginPlaceholder(
+    RenderFrame* render_frame,
+    blink::WebLocalFrame* frame,
+    const blink::WebPluginParams& params) {
   return nullptr;
 }