Remove generated directories with 100s of files.

client/html/generated/html/dartium/CSSKeyframesRule.dart

Index: client/html/generated/html/dartium/CSSKeyframesRule.dart
diff --git a/client/html/generated/html/dartium/CSSKeyframesRule.dart b/client/html/generated/html/dartium/CSSKeyframesRule.dart
deleted file mode 100644
index 448396024b04493897655192f13fe3ada46ea8aa..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/CSSKeyframesRule.dart
+++ /dev/null
@@ -1,24 +0,0 @@
-
-class _CSSKeyframesRuleImpl extends _CSSRuleImpl implements CSSKeyframesRule {
-  _CSSKeyframesRuleImpl._wrap(ptr) : super._wrap(ptr);
-
-  CSSRuleList get cssRules() => _wrap(_ptr.cssRules);
-
-  String get name() => _wrap(_ptr.name);
-
-  void set name(String value) { _ptr.name = _unwrap(value); }
-
-  void deleteRule(String key) {
-    _ptr.deleteRule(_unwrap(key));
-    return;
-  }
-
-  CSSKeyframeRule findRule(String key) {
-    return _wrap(_ptr.findRule(_unwrap(key)));
-  }
-
-  void insertRule(String rule) {
-    _ptr.insertRule(_unwrap(rule));
-    return;
-  }
-}