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

Source/modules/accessibility/AXSVGRoot.h

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 11 matching lines @@
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef AXSVGRoot_h
 #define AXSVGRoot_h
 
-#include "core/accessibility/AXRenderObject.h"
+#include "modules/accessibility/AXRenderObject.h"
 
 namespace blink {
 
 class AXSVGRoot final : public AXRenderObject {
 
 protected:
     explicit AXSVGRoot(RenderObject*);
 public:
     static PassRefPtr<AXSVGRoot> create(RenderObject*);
     virtual ~AXSVGRoot();
 
     void setParent(AXObject*) override;
 
 private:
     virtual AXObject* computeParent() const override;
     virtual bool isAXSVGRoot() const override { return true; }
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXSVGRoot, isAXSVGRoot());
 
 } // namespace blink
 
 #endif // AXSVGRoot_h