Improve support for :read-only and :read-write pseudoclasses.

Source/core/rendering/RenderTheme.cpp

Index: Source/core/rendering/RenderTheme.cpp
diff --git a/Source/core/rendering/RenderTheme.cpp b/Source/core/rendering/RenderTheme.cpp
index 329aa8567c6a0f261efd545c0b796883b207424e..44243a8cdb0abdf79e8b8b0911bfd1be5df6dfa7 100644
--- a/Source/core/rendering/RenderTheme.cpp
+++ b/Source/core/rendering/RenderTheme.cpp
@@ -32,6 +32,7 @@
 #include "core/fileapi/FileList.h"
 #include "core/html/HTMLCollection.h"
 #include "core/html/HTMLDataListElement.h"
+#include "core/html/HTMLFormControlElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLMeterElement.h"
 #include "core/html/HTMLOptionElement.h"
@@ -769,9 +770,10 @@ bool RenderTheme::isSpinUpButtonPartPressed(const RenderObject* o) const
 bool RenderTheme::isReadOnlyControl(const RenderObject* o) const
 {
     Node* node = o->node();
-    if (!node || !node->isElementNode())
+    if (!node || !node->isElementNode() || !toElement(node)->isFormControlElement())
         return false;
-    return toElement(node)->matchesReadOnlyPseudoClass();
+    HTMLFormControlElement* element = toHTMLFormControlElement(node);
+    return element->isReadOnly();
 }
 
 bool RenderTheme::isHovered(const RenderObject* o) const