Move all geofencing code into its own module separate from geolocation.

Source/modules/geolocation/GeofencingRegion.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef GeofencingRegion_h
-#define GeofencingRegion_h
-
-#include "bindings/core/v8/ScriptWrappable.h"
-#include "platform/heap/Handle.h"
-#include "wtf/text/WTFString.h"
-
-namespace blink {
-
-class GeofencingRegion : public GarbageCollectedFinalized<GeofencingRegion>, public ScriptWrappable {
-    WTF_MAKE_NONCOPYABLE(GeofencingRegion);
-public:
-    virtual ~GeofencingRegion() { }
-
-    String id() const { return m_id; }
-
-    virtual void trace(Visitor*) { }
-
-protected:
-    GeofencingRegion(const String& id) : m_id(id) { }
-
-private:
-    String m_id;
-};
-
-} // namespace blink
-
-#endif