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

third_party/WebKit/Source/core/dom/Node.cpp

Index: third_party/WebKit/Source/core/dom/Node.cpp
diff --git a/third_party/WebKit/Source/core/dom/Node.cpp b/third_party/WebKit/Source/core/dom/Node.cpp
index 2c1b5bee29fb8df519818bd1fb51beae183a9303..dcdb71f0bed37739deb2b2c0e62b29da6c3c872e 100644
--- a/third_party/WebKit/Source/core/dom/Node.cpp
+++ b/third_party/WebKit/Source/core/dom/Node.cpp
@@ -90,8 +90,10 @@
 #include "core/html/HTMLSlotElement.h"
 #include "core/input/EventHandler.h"
 #include "core/layout/LayoutBox.h"
+#include "core/layout/LayoutPart.h"
 #include "core/page/ContextMenuController.h"
 #include "core/page/Page.h"
+#include "core/plugins/PluginView.h"
 #include "core/svg/SVGElement.h"
 #include "core/svg/graphics/SVGImage.h"
 #include "platform/EventDispatchForbiddenScope.h"
@@ -2579,6 +2581,22 @@ void Node::CheckSlotChange(SlotChangeType slot_change_type) {
   }
 }
 
+WebPluginContainerBase* Node::GetWebPluginContainerBase() const {
+  if (!isHTMLObjectElement(this) && !isHTMLEmbedElement(this)) {
+    return nullptr;
+  }
+
+  LayoutObject* object = GetLayoutObject();
+  if (object && object->IsLayoutPart()) {
+    PluginView* plugin = ToLayoutPart(object)->Plugin();
+    if (plugin) {
+      return plugin->GetWebPluginContainerBase();
+    }
+  }
+
+  return nullptr;
+}
+
 DEFINE_TRACE(Node) {
   visitor->Trace(parent_or_shadow_host_node_);
   visitor->Trace(previous_);