Blink Plugins: Remove Shadow DOM Plugin Placeholder

Source/core/loader/EmptyClients.h

Index: Source/core/loader/EmptyClients.h
diff --git a/Source/core/loader/EmptyClients.h b/Source/core/loader/EmptyClients.h
index 1449103d63447ab1648056585abb3420d82cb358..90bca2c31d7135353cf15bb691bde3f0ac04e75c 100644
--- a/Source/core/loader/EmptyClients.h
+++ b/Source/core/loader/EmptyClients.h
@@ -230,7 +230,6 @@ public:
     void didDispatchPingLoader(const KURL&) override {}
     void selectorMatchChanged(const Vector<String>&, const Vector<String>&) override {}
     PassRefPtrWillBeRawPtr<LocalFrame> createFrame(const FrameLoadRequest&, const AtomicString&, HTMLFrameOwnerElement*) override;
-    PassOwnPtrWillBeRawPtr<PluginPlaceholder> createPluginPlaceholder(Document&, const KURL&, const Vector<String>& paramNames, const Vector<String>& paramValues, const String& mimeType, bool loadManually) override;
     PassRefPtrWillBeRawPtr<Widget> createPlugin(HTMLPlugInElement*, const KURL&, const Vector<String>&, const Vector<String>&, const String&, bool, DetachedPluginPolicy) override;
     bool canCreatePluginWithoutRenderer(const String& mimeType) const override { return false; }
     PassRefPtrWillBeRawPtr<Widget> createJavaAppletWidget(HTMLAppletElement*, const KURL&, const Vector<String>&, const Vector<String>&) override;