Revert "Fix a few strong mode errors in dart:html"

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

Index: tools/dom/templates/html/impl/impl_Document.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Document.darttemplate b/tools/dom/templates/html/impl/impl_Document.darttemplate
index c5a1ef2e50284ad2097be3709f89a1758ffbd94d..9dae6c78d4e79daaaa71f84043ba74c3b9b5a0a5 100644
--- a/tools/dom/templates/html/impl/impl_Document.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Document.darttemplate
@@ -114,22 +114,5 @@ $if DART2JS
       [int whatToShow, NodeFilter filter])
       => JS('TreeWalker', '#.createTreeWalker(#, #, #, false)',
           this, root, whatToShow, filter);
-
-  /**
-   * Returns true if this document can display elements in fullscreen mode.
-   *
-   * ## Other resources
-   *
-   * * [Using the fullscreen
-   *   API](http://docs.webplatform.org/wiki/tutorials/using_the_full-screen_api)
-   *   from WebPlatform.org.
-   * * [Fullscreen specification](http://www.w3.org/TR/fullscreen/) from W3C.
-   */
-  @DomName('Document.webkitFullscreenEnabled')
-  @SupportedBrowser(SupportedBrowser.CHROME)
-  @SupportedBrowser(SupportedBrowser.SAFARI)
-  @Experimental()
-  bool get fullscreenEnabled => _webkitFullscreenEnabled;
-
 $endif
 }