Revert 20127

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

Index: tools/dom/templates/html/impl/impl_Window.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Window.darttemplate b/tools/dom/templates/html/impl/impl_Window.darttemplate
index 2f1c19438ab4c468e5fbda46b2cdff58ddf05a0b..d8d90d610417447acfb9a3423f784baee18a2522 100644
--- a/tools/dom/templates/html/impl/impl_Window.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Window.darttemplate
@@ -225,16 +225,5 @@ $else
   }
 $endif
 
-  /**
-   * Access a sandboxed file system of the specified `size`. If `persistent` is
-   * 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);
-  }
 $!MEMBERS
 }