Use FocusParams in FocusController::setFocusedElement and Document::setFocusedElement arguments.

third_party/WebKit/Source/core/editing/FrameSelection.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1079 matching lines @@
         while (target) {
             // We don't want to set focus on a subframe when selecting in a parent frame,
             // so add the !isFrameElement check here. There's probably a better way to make this
             // work in the long term, but this is the safest fix at this time.
             if (target->isMouseFocusable() && !isFrameElement(target)) {
                 m_frame->page()->focusController().setFocusedElement(target, m_frame);
                 return;
             }
             target = target->parentOrShadowHostElement();
         }
-        m_frame->document()->setFocusedElement(nullptr);
+        m_frame->document()->clearFocusedElement();
     }
 
     if (caretBrowsing)
         m_frame->page()->focusController().setFocusedElement(0, m_frame);
 }
 
 template <typename Strategy>
 String extractSelectedTextAlgorithm(const FrameSelection& selection, TextIteratorBehavior behavior)
 {
     const VisibleSelectionTemplate<Strategy> visibleSelection = selection.visibleSelection<Strategy>();
@@ skipping 290 matching lines @@
 
 void showTree(const blink::FrameSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
     else
         fprintf(stderr, "Cannot showTree for (nil) FrameSelection.\n");
 }
 
 #endif