Remove generated directories with 100s of files.

client/html/generated/html/dartium/CSSStyleSheet.dart

Index: client/html/generated/html/dartium/CSSStyleSheet.dart
diff --git a/client/html/generated/html/dartium/CSSStyleSheet.dart b/client/html/generated/html/dartium/CSSStyleSheet.dart
deleted file mode 100644
index f9d660b981732acff3d598397b30f4d8f306f6a5..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/CSSStyleSheet.dart
+++ /dev/null
@@ -1,32 +0,0 @@
-
-class _CSSStyleSheetImpl extends _StyleSheetImpl implements CSSStyleSheet {
-  _CSSStyleSheetImpl._wrap(ptr) : super._wrap(ptr);
-
-  CSSRuleList get cssRules() => _wrap(_ptr.cssRules);
-
-  CSSRule get ownerRule() => _wrap(_ptr.ownerRule);
-
-  CSSRuleList get rules() => _wrap(_ptr.rules);
-
-  int addRule(String selector, String style, [int index = null]) {
-    if (index === null) {
-      return _wrap(_ptr.addRule(_unwrap(selector), _unwrap(style)));
-    } else {
-      return _wrap(_ptr.addRule(_unwrap(selector), _unwrap(style), _unwrap(index)));
-    }
-  }
-
-  void deleteRule(int index) {
-    _ptr.deleteRule(_unwrap(index));
-    return;
-  }
-
-  int insertRule(String rule, int index) {
-    return _wrap(_ptr.insertRule(_unwrap(rule), _unwrap(index)));
-  }
-
-  void removeRule(int index) {
-    _ptr.removeRule(_unwrap(index));
-    return;
-  }
-}