Remove generated directories with 100s of files.

client/dom/generated/src/frog/Element.dart

-
-class _ElementJs extends _NodeJs implements Element native "*Element" {
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-  static final int ALLOW_KEYBOARD_INPUT = 1;
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-  final int childElementCount;
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-  final int clientHeight;
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-  final int clientLeft;
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-  final int clientTop;
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-  final int clientWidth;
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-  final _ElementJs firstElementChild;
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-  final _ElementJs lastElementChild;
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-  final _ElementJs nextElementSibling;
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-  final int offsetHeight;
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-  final int offsetLeft;
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-  final _ElementJs offsetParent;
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-  final int offsetTop;
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-  final int offsetWidth;
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-  final _ElementJs previousElementSibling;
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-  final int scrollHeight;
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-  int scrollLeft;
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-  int scrollTop;
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-  final int scrollWidth;
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-  final _CSSStyleDeclarationJs style;
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-  final String tagName;
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-  final String webkitRegionOverflow;
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-  void blur() native;
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-  void focus() native;
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-  String getAttribute(String name) native;
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-  String getAttributeNS(String namespaceURI, String localName) native;
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-  _AttrJs getAttributeNode(String name) native;
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-  _AttrJs getAttributeNodeNS(String namespaceURI, String localName) native;
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-  _ClientRectJs getBoundingClientRect() native;
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-  _ClientRectListJs getClientRects() native;
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-  _NodeListJs getElementsByClassName(String name) native;
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-  _NodeListJs getElementsByTagName(String name) native;
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-  _NodeListJs getElementsByTagNameNS(String namespaceURI, String localName) native;
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-  bool hasAttribute(String name) native;
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-  bool hasAttributeNS(String namespaceURI, String localName) native;
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-  _ElementJs querySelector(String selectors) native;
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-  _NodeListJs querySelectorAll(String selectors) native;
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-  void removeAttribute(String name) native;
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-  void removeAttributeNS(String namespaceURI, String localName) native;
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-  _AttrJs removeAttributeNode(_AttrJs oldAttr) native;
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-  void scrollByLines(int lines) native;
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-  void scrollByPages(int pages) native;
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-  void scrollIntoView([bool alignWithTop = null]) native;
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-  void scrollIntoViewIfNeeded([bool centerIfNeeded = null]) native;
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-  void setAttribute(String name, String value) native;
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-  void setAttributeNS(String namespaceURI, String qualifiedName, String value) native;
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-  _AttrJs setAttributeNode(_AttrJs newAttr) native;
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-  _AttrJs setAttributeNodeNS(_AttrJs newAttr) native;
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-  bool webkitMatchesSelector(String selectors) native;
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-  void webkitRequestFullScreen(int flags) native;
-}