Revert of Use Shadow DOM to display fallback content for images

Source/modules/accessibility/AXRenderObject.cpp

Index: Source/modules/accessibility/AXRenderObject.cpp
diff --git a/Source/modules/accessibility/AXRenderObject.cpp b/Source/modules/accessibility/AXRenderObject.cpp
index d0ba4a20d0fbf07854c40fd8e61307735d87f43e..aaccaacbfc23aac6aa405be6ee28755266f7de4e 100644
--- a/Source/modules/accessibility/AXRenderObject.cpp
+++ b/Source/modules/accessibility/AXRenderObject.cpp
@@ -253,17 +253,6 @@
     return box->scrollableArea();
 }
 
-static bool isImageOrAltText(RenderBoxModelObject* box, Node* node)
-{
-    if (box && box->isImage())
-        return true;
-    if (isHTMLImageElement(node))
-        return true;
-    if (isHTMLInputElement(node) && toHTMLInputElement(node)->hasFallbackContent())
-        return true;
-    return false;
-}
-
 AccessibilityRole AXRenderObject::determineAccessibilityRole()
 {
     if (!m_renderer)
@@ -279,7 +268,7 @@
     RenderBoxModelObject* cssBox = renderBoxModelObject();
 
     if (node && node->isLink()) {
-        if (isImageOrAltText(cssBox, node))
+        if (cssBox && cssBox->isImage())
             return ImageMapRole;
         return LinkRole;
     }
@@ -300,7 +289,7 @@
         return LegendRole;
     if (m_renderer->isText())
         return StaticTextRole;
-    if (isImageOrAltText(cssBox, node)) {
+    if (cssBox && cssBox->isImage()) {
         if (isHTMLInputElement(node))
             return ariaHasPopup() ? PopUpButtonRole : ButtonRole;
         if (isSVGImage())
@@ -791,7 +780,7 @@
                 return true;
         }
 
-        if (isNativeImage() && isImageOrAltText(toRenderBoxModelObject(m_renderer), node)) {
+        if (isNativeImage() && m_renderer->isImage()) {
             // check for one-dimensional image
             RenderImage* image = toRenderImage(m_renderer);
             if (image->height() <= 1 || image->width() <= 1)