Revert of Use Shadow DOM to display fallback content for images

Source/core/accessibility/AXRenderObject.cpp

Index: Source/core/accessibility/AXRenderObject.cpp
diff --git a/Source/core/accessibility/AXRenderObject.cpp b/Source/core/accessibility/AXRenderObject.cpp
index d0550795d5aee99c0c21ed38db3219ce8a479c2e..13e7424de97ae56866d1c531ead7497973014032 100644
--- a/Source/core/accessibility/AXRenderObject.cpp
+++ b/Source/core/accessibility/AXRenderObject.cpp
@@ -297,11 +297,6 @@
         return ImageRole;
     }
 
-    // This is for the case where the fallback content kicks in.
-    // The normal case should be handled in the case above
-    if (node && node->hasTagName(HTMLNames::imgTag))
-        return ImageRole;
-
     // Note: if JavaScript is disabled, the renderer won't be a RenderHTMLCanvas.
     if (isHTMLCanvasElement(node) && m_renderer->isCanvas())
         return CanvasRole;