Making almost all dom_ methods private. Exceptions will be addressed in a later CL.

tools/dom/templates/html/dart2js/impl_MouseEvent.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;
 
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   factory $CLASSNAME(String type,
       {Window view, int detail: 0, int screenX: 0, int screenY: 0,
       int clientX: 0, int clientY: 0, int button: 0, bool canBubble: true,
       bool cancelable: true, bool ctrlKey: false, bool altKey: false,
       bool shiftKey: false, bool metaKey: false, EventTarget relatedTarget}) {
 
     if (view == null) {
       view = window;
     }
-    var event = document.$dom_createEvent('MouseEvent');
-    event.$dom_initMouseEvent(type, canBubble, cancelable, view, detail,
+    var event = document._createEvent('MouseEvent');
+    event._initMouseEvent(type, canBubble, cancelable, view, detail,
         screenX, screenY, clientX, clientY, ctrlKey, altKey, shiftKey, metaKey,
         button, relatedTarget);
     return event;
   }
 $!MEMBERS
 
   @deprecated
   int get clientX => client.x;
   @deprecated
   int get clientY => client.y;
   @deprecated
   int get offsetX => offset.x;
   @deprecated
   int get offsetY => offset.y;
   @deprecated
   int get movementX => movement.x;
   @deprecated
   int get movementY => movement.y;
   @deprecated
   int get screenX => screen.x;
   @deprecated
   int get screenY => screen.y;
 
   @DomName('MouseEvent.clientX')
   @DomName('MouseEvent.clientY')
-  Point get client => new Point($dom_clientX, $dom_clientY);
+  Point get client => new Point(_clientX, _clientY);
 
   @DomName('MouseEvent.movementX')
   @DomName('MouseEvent.movementY')
   @SupportedBrowser(SupportedBrowser.CHROME)
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental()
-  Point get movement => new Point($dom_webkitMovementX, $dom_webkitMovementY);
+  Point get movement => new Point(_webkitMovementX, _webkitMovementY);
 
   /**
    * The coordinates of the mouse pointer in target node coordinates.
    *
    * This value may vary between platforms if the target node moves
    * after the event has fired or if the element has CSS transforms affecting
    * it.
    */
   Point get offset {
     if (JS('bool', '!!#.offsetX', this)) {
       var x = JS('int', '#.offsetX', this);
       var y = JS('int', '#.offsetY', this);
       return new Point(x, y);
     } else {
       // Firefox does not support offsetX.
       if (!(this.target is Element)) {
         throw new UnsupportedError(
             'offsetX is only supported on elements');
       }
       Element target = this.target;
       return (this.client - target.getBoundingClientRect().topLeft).toInt();
     }
   }
 
   @DomName('MouseEvent.screenX')
   @DomName('MouseEvent.screenY')
-  Point get screen => new Point($dom_screenX, $dom_screenY);
+  Point get screen => new Point(_screenX, _screenY);
 }