Create Source/modules/accessibility/ and move most of core/accessibility/* into it

Source/modules/accessibility/AXSlider.cpp

Index: Source/modules/accessibility/AXSlider.cpp
diff --git a/Source/core/accessibility/AXSlider.cpp b/Source/modules/accessibility/AXSlider.cpp
similarity index 98%
rename from Source/core/accessibility/AXSlider.cpp
rename to Source/modules/accessibility/AXSlider.cpp
index 7801f11aae11de9c74de453288c0bb6259b7a17c..bba5d6766ac8068d1c5968c14b80b1d5ca7cef70 100644
--- a/Source/core/accessibility/AXSlider.cpp
+++ b/Source/modules/accessibility/AXSlider.cpp
@@ -27,13 +27,13 @@
  */
 
 #include "config.h"
-#include "core/accessibility/AXSlider.h"
+#include "modules/accessibility/AXSlider.h"
 
-#include "core/accessibility/AXObjectCacheImpl.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/shadow/ShadowElementNames.h"
 #include "core/rendering/RenderObject.h"
+#include "modules/accessibility/AXObjectCacheImpl.h"
 
 namespace blink {