Do not use Node in FocusController

third_party/WebKit/Source/core/page/FocusController.h

Index: third_party/WebKit/Source/core/page/FocusController.h
diff --git a/third_party/WebKit/Source/core/page/FocusController.h b/third_party/WebKit/Source/core/page/FocusController.h
index 02be6b3bc6392bcda7b6d06a616cbf013032e5d1..bd7d5e3cae6420a22b218b0888e3828a78d5f1ab 100644
--- a/third_party/WebKit/Source/core/page/FocusController.h
+++ b/third_party/WebKit/Source/core/page/FocusController.h
@@ -70,7 +70,7 @@ public:
     bool setInitialFocus(WebFocusType);
     bool advanceFocus(WebFocusType type, InputDeviceCapabilities* sourceCapabilities = nullptr) { return advanceFocus(type, false, sourceCapabilities); }
     bool advanceFocusAcrossFrames(WebFocusType, RemoteFrame* from, LocalFrame* to, InputDeviceCapabilities* sourceCapabilities = nullptr);
-    Element* findFocusableElement(WebFocusType, Node&);
+    Element* findFocusableElementInShadowHost(const Element& shadowHost);
 
     bool setFocusedElement(Element*, PassRefPtrWillBeRawPtr<Frame>, const FocusParams&);
     // |setFocusedElement| variant with SelectionBehaviorOnFocus::None,
@@ -88,6 +88,8 @@ public:
 private:
     explicit FocusController(Page*);
 
+    Element* findFocusableElement(WebFocusType, Element&);
+
     bool advanceFocus(WebFocusType, bool initialFocus, InputDeviceCapabilities* sourceCapabilities = nullptr);
     bool advanceFocusDirectionally(WebFocusType);
     bool advanceFocusInDocumentOrder(LocalFrame*, Node* startingNode, WebFocusType, bool initialFocus, InputDeviceCapabilities* sourceCapabilities);