Remove unused arguments of blink::PopupMenu::show().

third_party/WebKit/Source/web/ExternalPopupMenu.h

Index: third_party/WebKit/Source/web/ExternalPopupMenu.h
diff --git a/third_party/WebKit/Source/web/ExternalPopupMenu.h b/third_party/WebKit/Source/web/ExternalPopupMenu.h
index e892ee2f4a9403a546cbccc2b7c4abb4264c203b..4dda6d4f2f81ab1fb3e85eb47710a7cc0780b769 100644
--- a/third_party/WebKit/Source/web/ExternalPopupMenu.h
+++ b/third_party/WebKit/Source/web/ExternalPopupMenu.h
@@ -39,9 +39,7 @@
 
 namespace blink {
 
-class FloatQuad;
 class HTMLSelectElement;
-class IntSize;
 class LocalFrame;
 class WebExternalPopupMenu;
 class WebMouseEvent;
@@ -67,7 +65,7 @@ public:
 
 private:
     // PopupMenu methods:
-    void show(const FloatQuad& controlPosition, const IntSize&, int index) override;
+    void show() override;
     void hide() override;
     void updateFromElement() override;
     void disconnectClient() override;