Move geometry interface files to geometry directory.

third_party/WebKit/Source/core/geometry/DOMPointReadOnly.idl

 // 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.
 
 // https://drafts.fxtf.org/geometry/#dompointreadonly
 
 [
     Constructor(optional unrestricted double x = 0, optional unrestricted double y = 0,
                 optional unrestricted double z = 0, optional unrestricted double w = 1),
     Exposed=(Window,Worker),
     RuntimeEnabled=GeometryInterfaces,
 ] interface DOMPointReadOnly {
     [NewObject] static DOMPointReadOnly fromPoint(optional DOMPointInit other);
 
     readonly attribute unrestricted double x;
     readonly attribute unrestricted double y;
     readonly attribute unrestricted double z;
     readonly attribute unrestricted double w;
 
     [RaisesException] DOMPoint matrixTransform(optional DOMMatrixInit matrix);
 
     serializer = { attribute };
 };