Use "Dictionary" for PositionOptions instead of Custom binding

Source/modules/geolocation/PositionOptions.h

Index: Source/modules/geolocation/PositionOptions.h
diff --git a/Source/modules/geolocation/PositionOptions.h b/Source/modules/geolocation/PositionOptions.h
index d3d9ffc8a9dfdf7e51e004704e3616ad46f2de82..046e460599c12ea84f17e76196636926eed08051 100644
--- a/Source/modules/geolocation/PositionOptions.h
+++ b/Source/modules/geolocation/PositionOptions.h
@@ -27,13 +27,14 @@
 #define PositionOptions_h
 
 #include "platform/heap/Handle.h"
-#include <limits.h>
 
 namespace WebCore {
 
+class Dictionary;
+
 class PositionOptions : public GarbageCollected<PositionOptions> {
 public:
-    static PositionOptions* create() { return new PositionOptions(); }
+    static PositionOptions* create(const Dictionary&);
     void trace(Visitor*) { }
 
     bool enableHighAccuracy() const { return m_highAccuracy; }
@@ -56,14 +57,7 @@ public:
     }
 
 private:
-    PositionOptions()
-        : m_highAccuracy(false)
-        , m_maximumAge(0)
-        , m_timeout(std::numeric_limits<unsigned>::max())
-
-    {
-        setMaximumAge(0);
-    }
+    explicit PositionOptions(const Dictionary&);
 
     bool m_highAccuracy;
     unsigned m_maximumAge;