Remove Frame::host() method

third_party/WebKit/Source/core/html/HTMLFormElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
  * reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 432 matching lines @@
   Frame* targetFrame = document().frame()->findFrameForNavigation(
       submission->target(), *document().frame());
   if (!targetFrame) {
     if (!LocalDOMWindow::allowPopUp(*document().frame()) &&
         !UserGestureIndicator::utilizeUserGesture())
       return;
     targetFrame = document().frame();
   } else {
     submission->clearTarget();
   }
-  if (!targetFrame->host())
+  if (!targetFrame->page())
     return;
 
   UseCounter::count(document(), UseCounter::FormsSubmitted);
   if (MixedContentChecker::isMixedFormAction(document().frame(),
                                              submission->action()))
     UseCounter::count(document().frame(),
                       UseCounter::MixedContentFormsSubmitted);
 
   // TODO(lukasza): Investigate if the code below can uniformly handle remote
   // and local frames (i.e. by calling virtual Frame::navigate from a timer).
@@ skipping 363 matching lines @@
   for (const auto& control : listedElements()) {
     if (!control->isFormControlElement())
       continue;
     if (toHTMLFormControlElement(control)->canBeSuccessfulSubmitButton())
       toHTMLFormControlElement(control)->pseudoStateChanged(
           CSSSelector::PseudoDefault);
   }
 }
 
 }  // namespace blink