Move the logic to retrieve the WebPluginContainer to LocalFrame and Node.

third_party/WebKit/Source/core/plugins/PluginView.h

Index: third_party/WebKit/Source/core/plugins/PluginView.h
diff --git a/third_party/WebKit/Source/core/plugins/PluginView.h b/third_party/WebKit/Source/core/plugins/PluginView.h
index aa57ca011d3dd3e8d397d6396fd4a8f118c75010..e0f1a67531f4f5a7eb94b9f00d14a5803ae61f35 100644
--- a/third_party/WebKit/Source/core/plugins/PluginView.h
+++ b/third_party/WebKit/Source/core/plugins/PluginView.h
@@ -42,6 +42,7 @@ class Event;
 class FrameView;
 class ResourceResponse;
 class WebLayer;
+class WebPluginContainerBase;
 
 // TODO(joelhockey): Remove this class.
 // The only implementation of this class is web/WebPluginContainerImpl.
@@ -77,6 +78,9 @@ class CORE_EXPORT PluginView : public FrameOrPlugin {
 
   virtual void UpdateAllLifecyclePhases() {}
   virtual void InvalidatePaint() {}
+  virtual WebPluginContainerBase* GetWebPluginContainerBase() const {
+    return nullptr;
+  }
 };
 
 DEFINE_TYPE_CASTS(PluginView,