Rewrite references to "wtf/" to "platform/wtf/" in core/{dom,html,xml}.

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/ElementVisibilityObserver.h"
 
 #include "core/dom/Element.h"
 #include "core/dom/IntersectionObserverEntry.h"
 #include "core/frame/LocalFrame.h"
-#include "wtf/Functional.h"
+#include "platform/wtf/Functional.h"
 
 namespace blink {
 
 ElementVisibilityObserver::ElementVisibilityObserver(
     Element* element,
     std::unique_ptr<VisibilityCallback> callback)
     : element_(element), callback_(std::move(callback)) {}
 
 ElementVisibilityObserver::~ElementVisibilityObserver() = default;
 
@@ skipping 30 matching lines @@
   visitor->Trace(intersection_observer_);
 }
 
 void ElementVisibilityObserver::OnVisibilityChanged(
     const HeapVector<Member<IntersectionObserverEntry>>& entries) {
   bool is_visible = entries.back()->intersectionRatio() > 0.f;
   (*callback_.get())(is_visible);
 }
 
 }  // namespace blink