Remove <picture> and <source>.

sky/engine/core/html/HTMLPictureElement.cpp

-// Copyright 2014 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 "config.h"
-#include "core/html/HTMLPictureElement.h"
-
-#include "core/HTMLNames.h"
-#include "core/dom/ElementTraversal.h"
-#include "core/frame/UseCounter.h"
-#include "core/html/HTMLImageElement.h"
-#include "core/loader/ImageLoader.h"
-
-namespace blink {
-
-inline HTMLPictureElement::HTMLPictureElement(Document& document)
-    : HTMLElement(HTMLNames::pictureTag, document)
-{
-    ScriptWrappable::init(this);
-}
-
-DEFINE_NODE_FACTORY(HTMLPictureElement)
-
-void HTMLPictureElement::sourceOrMediaChanged()
-{
-    for (HTMLImageElement* imageElement = Traversal<HTMLImageElement>::firstChild(*this); imageElement; imageElement = Traversal<HTMLImageElement>::nextSibling(*imageElement)) {
-        imageElement->selectSourceURL(ImageLoader::UpdateNormal);
-    }
-}
-
-Node::InsertionNotificationRequest HTMLPictureElement::insertedInto(ContainerNode* insertionPoint)
-{
-    UseCounter::count(document(), UseCounter::Picture);
-    return HTMLElement::insertedInto(insertionPoint);
-}
-
-} // namespace