Mark supportsPointConversions deprecated and always true rather than testing DOMPoint

tools/dom/templates/html/impl/impl_Window.darttemplate

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of $LIBRARYNAME;
 
 @DocsEditable()
 $if DART2JS
 $(ANNOTATIONS)@Native("Window,DOMWindow")
 $(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS {
@@ skipping 199 matching lines @@
    * true, the application will request permission from the user to create
    * lasting storage. This storage cannot be freed without the user's
    * permission. Returns a [Future] whose value stores a reference to the
    * sandboxed file system for use. Because the file system is sandboxed,
    * applications cannot access file systems created in other web pages.
    */
   Future<FileSystem> requestFileSystem(int size, {bool persistent: false}) {
     return _requestFileSystem(persistent? 1 : 0, size);
   }
 
-  /**
-   * convertPointFromNodeToPage and convertPointFromPageToNode are removed.
-   * see http://dev.w3.org/csswg/cssom-view/#geometry
-   */
-  static bool get supportsPointConversions => DomPoint.supported;
+  /// Obsolete API for testing if Geometry APIs supported.
+  @Deprecated("Obsolete")
+  static bool get supportsPointConversions => true;
 $!MEMBERS
 
   /**
    * Static factory designed to expose `beforeunload` events to event
    * handlers that are not necessarily instances of [Window].
    *
    * See [EventStreamProvider] for usage information.
    */
   @DomName('Window.beforeunloadEvent')
   static const EventStreamProvider<BeforeUnloadEvent> beforeUnloadEvent =
@@ skipping 126 matching lines @@
 
   ElementStream<BeforeUnloadEvent> forElement(Element e, {bool useCapture: false}) {
     return new _ElementEventStreamImpl(e, _eventType, useCapture);
   }
 
   ElementStream<BeforeUnloadEvent> _forElementList(ElementList e,
       {bool useCapture: false}) {
     return new _ElementListEventStreamImpl(e, _eventType, useCapture);
   }
 }