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

Source/modules/geolocation/CircularRegion.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 CircularRegion_h
-#define CircularRegion_h
-
-#include "modules/geolocation/GeofencingRegion.h"
-
-namespace blink {
-
-class Dictionary;
-
-struct CircularRegionInit {
-    CircularRegionInit() : latitude(0), longitude(0), radius(0) { }
-    explicit CircularRegionInit(const Dictionary& init);
-
-    String id;
-    double latitude;
-    double longitude;
-    double radius;
-};
-
-class CircularRegion FINAL : public GeofencingRegion {
-    WTF_MAKE_NONCOPYABLE(CircularRegion);
-public:
-    static CircularRegion* create(const Dictionary& init);
-    virtual ~CircularRegion() { }
-
-    double latitude() const { return m_latitude; }
-    double longitude() const { return m_longitude; }
-    double radius() const { return m_radius; }
-
-    virtual void trace(Visitor* visitor) OVERRIDE { GeofencingRegion::trace(visitor); }
-
-private:
-    explicit CircularRegion(const CircularRegionInit&);
-
-    double m_latitude;
-    double m_longitude;
-    double m_radius;
-};
-
-} // namespace blink
-
-#endif