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

tools/dom/templates/html/impl/impl_HTMLDocument.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.
 
 // WARNING: Do not edit - generated code.
 
 part of $LIBRARYNAME;
 
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 $!MEMBERS
 
 $if DART2JS
   @DomName('Document.body')
   BodyElement body;
 $else
   @DomName('Document.body')
-  BodyElement get body => $dom_body;
+  BodyElement get body => _body;
 
   @DomName('Document.body')
   void set body(BodyElement value) {
-    $dom_body = value;
+    _body = value;
   }
 $endif
 
   @DomName('Document.caretRangeFromPoint')
   Range caretRangeFromPoint(int x, int y) {
-    return $dom_caretRangeFromPoint(x, y);
+    return _caretRangeFromPoint(x, y);
   }
 
   @DomName('Document.elementFromPoint')
   Element elementFromPoint(int x, int y) {
-    return $dom_elementFromPoint(x, y);
+    return _elementFromPoint(x, y);
   }
 
   /**
    * Checks if the getCssCanvasContext API is supported on the current platform.
    *
    * See also:
    *
    * * [getCssCanvasContext]
    */
 $if DART2JS
@@ skipping 23 matching lines @@
    *
    * * [supportsCssCanvasContext]
    * * [CanvasElement.getContext]
    */
   @SupportedBrowser(SupportedBrowser.CHROME)
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental()
   @DomName('Document.getCSSCanvasContext')
   CanvasRenderingContext getCssCanvasContext(String contextId, String name,
       int width, int height) {
-    return $dom_getCssCanvasContext(contextId, name, width, height);
+    return _getCssCanvasContext(contextId, name, width, height);
   }
 
   @DomName('Document.head')
-  HeadElement get head => $dom_head;
+  HeadElement get head => _head;
 
   @DomName('Document.lastModified')
-  String get lastModified => $dom_lastModified;
+  String get lastModified => _lastModified;
 
   @DomName('Document.preferredStylesheetSet')
-  String get preferredStylesheetSet => $dom_preferredStylesheetSet;
+  String get preferredStylesheetSet => _preferredStylesheetSet;
 
   @DomName('Document.referrer')
-  String get referrer => $dom_referrer;
+  String get referrer => _referrer;
 
   @DomName('Document.selectedStylesheetSet')
-  String get selectedStylesheetSet => $dom_selectedStylesheetSet;
+  String get selectedStylesheetSet => _selectedStylesheetSet;
   void set selectedStylesheetSet(String value) {
-    $dom_selectedStylesheetSet = value;
+    _selectedStylesheetSet = value;
   }
 
   @DomName('Document.styleSheets')
-  List<StyleSheet> get styleSheets => $dom_styleSheets;
+  List<StyleSheet> get styleSheets => _styleSheets;
 
   @DomName('Document.title')
-  String get title => $dom_title;
+  String get title => _title;
 
   @DomName('Document.title')
   void set title(String value) {
-    $dom_title = value;
+    _title = value;
   }
 
   @DomName('Document.webkitCancelFullScreen')
   @SupportedBrowser(SupportedBrowser.CHROME)
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental()
   void cancelFullScreen() {
-    $dom_webkitCancelFullScreen();
+    _webkitCancelFullScreen();
   }
 
   @DomName('Document.webkitExitFullscreen')
   @SupportedBrowser(SupportedBrowser.CHROME)
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental()
   void exitFullscreen() {
-    $dom_webkitExitFullscreen();
+    _webkitExitFullscreen();
   }
 
   @DomName('Document.webkitExitPointerLock')
   @SupportedBrowser(SupportedBrowser.CHROME)
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental()
   void exitPointerLock() {
-    $dom_webkitExitPointerLock();
+    _webkitExitPointerLock();
   }
 
   @DomName('Document.webkitFullscreenElement')
   @SupportedBrowser(SupportedBrowser.CHROME)
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental()
-  Element get fullscreenElement => $dom_webkitFullscreenElement;
+  Element get fullscreenElement => _webkitFullscreenElement;
 
   @DomName('Document.webkitFullscreenEnabled')
   @SupportedBrowser(SupportedBrowser.CHROME)
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental()
-  bool get fullscreenEnabled => $dom_webkitFullscreenEnabled;
+  bool get fullscreenEnabled => _webkitFullscreenEnabled;
 
   @DomName('Document.webkitHidden')
   @SupportedBrowser(SupportedBrowser.CHROME)
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental()
-  bool get hidden => $dom_webkitHidden;
+  bool get hidden => _webkitHidden;
 
   @DomName('Document.webkitIsFullScreen')
   @SupportedBrowser(SupportedBrowser.CHROME)
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental()
-  bool get isFullScreen => $dom_webkitIsFullScreen;
+  bool get isFullScreen => _webkitIsFullScreen;
 
   @DomName('Document.webkitPointerLockElement')
   @SupportedBrowser(SupportedBrowser.CHROME)
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental()
   Element get pointerLockElement =>
-      $dom_webkitPointerLockElement;
+      _webkitPointerLockElement;
 
   @DomName('Document.webkitVisibilityState')
   @SupportedBrowser(SupportedBrowser.CHROME)
   @SupportedBrowser(SupportedBrowser.SAFARI)
   @Experimental()
-  String get visibilityState => $dom_webkitVisibilityState;
+  String get visibilityState => _webkitVisibilityState;
 
   @Experimental
 $if DART2JS
   void register(String tag, Type customElementClass) {
     _registerCustomElement(JS('', 'window'), this, tag, customElementClass);
   }
 $else
   void register(String tag, Type custom) {
     _Utils.register(tag, custom);
   }
 $endif
 
 $if DART2JS
   @Creates('Null')  // Set from Dart code; does not instantiate a native type.
 $endif
   // Note: used to polyfill <template>
   Document _templateContentsOwner;
 }