Revert of Use Shadow DOM to display fallback content for images

Source/core/html/HTMLImageFallbackHelper.cpp

Index: Source/core/html/HTMLImageFallbackHelper.cpp
diff --git a/Source/core/html/HTMLImageFallbackHelper.cpp b/Source/core/html/HTMLImageFallbackHelper.cpp
deleted file mode 100644
index b487c2854ef1cc5f9b936f831e371bc51d2a4008..0000000000000000000000000000000000000000
--- a/Source/core/html/HTMLImageFallbackHelper.cpp
+++ /dev/null
@@ -1,112 +0,0 @@
-// 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/HTMLImageFallbackHelper.h"
-
-#include "core/HTMLNames.h"
-#include "core/InputTypeNames.h"
-#include "core/dom/ElementRareData.h"
-#include "core/dom/Text.h"
-#include "core/dom/shadow/ShadowRoot.h"
-#include "core/fetch/ImageResource.h"
-#include "core/html/FormDataList.h"
-#include "core/html/HTMLDivElement.h"
-#include "core/html/HTMLElement.h"
-#include "core/html/HTMLImageElement.h"
-#include "core/html/HTMLImageLoader.h"
-#include "core/html/HTMLInputElement.h"
-#include "core/html/HTMLStyleElement.h"
-#include "wtf/PassOwnPtr.h"
-#include "wtf/text/StringBuilder.h"
-
-namespace blink {
-
-using namespace HTMLNames;
-
-static bool noImageSourceSpecified(const Element& element)
-{
-    bool noSrcSpecified = !element.hasAttribute(srcAttr) || element.getAttribute(srcAttr).isNull() || element.getAttribute(srcAttr).isEmpty();
-    bool noSrcsetSpecified = !element.hasAttribute(srcsetAttr) || element.getAttribute(srcsetAttr).isNull() || element.getAttribute(srcsetAttr).isEmpty();
-    return noSrcSpecified && noSrcsetSpecified;
-}
-
-void HTMLImageFallbackHelper::createAltTextShadowTree(Element& element)
-{
-    ShadowRoot& root = element.ensureUserAgentShadowRoot();
-
-    RefPtrWillBeRawPtr<HTMLDivElement> container = HTMLDivElement::create(element.document());
-    root.appendChild(container);
-    container->setAttribute(idAttr, AtomicString("alttext-container", AtomicString::ConstructFromLiteral));
-    container->setInlineStyleProperty(CSSPropertyOverflow, CSSValueHidden);
-    container->setInlineStyleProperty(CSSPropertyBorderWidth, 1, CSSPrimitiveValue::CSS_PX);
-    container->setInlineStyleProperty(CSSPropertyBorderStyle, CSSValueSolid);
-    container->setInlineStyleProperty(CSSPropertyBorderColor, CSSValueSilver);
-    container->setInlineStyleProperty(CSSPropertyDisplay, CSSValueInlineBlock);
-    container->setInlineStyleProperty(CSSPropertyBoxSizing, CSSValueBorderBox);
-    container->setInlineStyleProperty(CSSPropertyPadding, 1, CSSPrimitiveValue::CSS_PX);
-
-    RefPtrWillBeRawPtr<HTMLImageElement> brokenImage = HTMLImageElement::create(element.document());
-    container->appendChild(brokenImage);
-    brokenImage->setIsFallbackImage();
-    brokenImage->setAttribute(idAttr, AtomicString("alttext-image", AtomicString::ConstructFromLiteral));
-    brokenImage->setAttribute(widthAttr, AtomicString("16", AtomicString::ConstructFromLiteral));
-    brokenImage->setAttribute(heightAttr, AtomicString("16", AtomicString::ConstructFromLiteral));
-    brokenImage->setAttribute(alignAttr, AtomicString("left", AtomicString::ConstructFromLiteral));
-    brokenImage->setInlineStyleProperty(CSSPropertyMargin, 0, CSSPrimitiveValue::CSS_PX);
-
-    RefPtrWillBeRawPtr<HTMLDivElement> altText = HTMLDivElement::create(element.document());
-    container->appendChild(altText);
-    altText->setInlineStyleProperty(CSSPropertyOverflow, CSSValueHidden);
-    altText->setInlineStyleProperty(CSSPropertyDisplay, CSSValueBlock);
-
-    RefPtrWillBeRawPtr<Text> text = Text::create(element.document(), toHTMLElement(element).altText());
-    altText->appendChild(text);
-}
-
-PassRefPtr<RenderStyle> HTMLImageFallbackHelper::customStyleForAltText(Element& element, PassRefPtr<RenderStyle> newStyle)
-{
-    // If we have an author shadow root or have not created the UA shadow root yet, bail early. We can't
-    // use ensureUserAgentShadowRoot() here because that would alter the DOM tree during style recalc.
-    if (element.shadowRoot() || !element.userAgentShadowRoot())
-        return newStyle;
-
-    Element* placeHolder = element.userAgentShadowRoot()->getElementById("alttext-container");
-    Element* brokenImage = element.userAgentShadowRoot()->getElementById("alttext-image");
-
-    if (element.document().inQuirksMode()) {
-        // Mimic the behaviour of the image host by setting symmetric dimensions if only one dimension is specified.
-        if (newStyle->width().isSpecifiedOrIntrinsic() && newStyle->height().isAuto())
-            newStyle->setHeight(newStyle->width());
-        else if (newStyle->height().isSpecifiedOrIntrinsic() && newStyle->width().isAuto())
-            newStyle->setWidth(newStyle->height());
-        if (newStyle->width().isSpecifiedOrIntrinsic() && newStyle->height().isSpecifiedOrIntrinsic()) {
-            placeHolder->setInlineStyleProperty(CSSPropertyVerticalAlign, CSSValueBaseline);
-        }
-    }
-
-    // If the image has specified dimensions allow the alt-text container expand to fill them.
-    if (newStyle->width().isSpecifiedOrIntrinsic() && newStyle->height().isSpecifiedOrIntrinsic()) {
-        placeHolder->setInlineStyleProperty(CSSPropertyWidth, 100, CSSPrimitiveValue::CSS_PERCENTAGE);
-        placeHolder->setInlineStyleProperty(CSSPropertyHeight, 100, CSSPrimitiveValue::CSS_PERCENTAGE);
-    }
-
-    // Make sure the broken image icon appears on the appropriate side of the image for the element's writing direction.
-    brokenImage->setInlineStyleProperty(CSSPropertyFloat, AtomicString(newStyle->direction() == LTR ? "left" : "right"));
-
-    // This is an <img> with no attributes, so don't display anything.
-    if (noImageSourceSpecified(element) && !newStyle->width().isSpecifiedOrIntrinsic() && !newStyle->height().isSpecifiedOrIntrinsic() && toHTMLElement(element).altText().isEmpty())
-        newStyle->setDisplay(NONE);
-
-    // This preserves legacy behaviour originally defined when alt-text was managed by RenderImage.
-    if (noImageSourceSpecified(element))
-        brokenImage->setInlineStyleProperty(CSSPropertyDisplay, CSSValueNone);
-    else
-        brokenImage->setInlineStyleProperty(CSSPropertyDisplay, CSSValueInline);
-
-    return newStyle;
-}
-
-} // namespace blink
-