Remove generated directories with 100s of files.

client/html/generated/html/dartium/ShadowRoot.dart

Index: client/html/generated/html/dartium/ShadowRoot.dart
diff --git a/client/html/generated/html/dartium/ShadowRoot.dart b/client/html/generated/html/dartium/ShadowRoot.dart
deleted file mode 100644
index 3277c33e69b88e0d734a8d2a0cb1fa4329cdefef..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/ShadowRoot.dart
+++ /dev/null
@@ -1,26 +0,0 @@
-
-class _ShadowRootImpl extends _DocumentFragmentImpl implements ShadowRoot {
-  _ShadowRootImpl._wrap(ptr) : super._wrap(ptr);
-
-  Element get host() => _wrap(_ptr.host);
-
-  String get innerHTML() => _wrap(_ptr.innerHTML);
-
-  void set innerHTML(String value) { _ptr.innerHTML = _unwrap(value); }
-
-  Element getElementById(String elementId) {
-    return _wrap(_ptr.getElementById(_unwrap(elementId)));
-  }
-
-  NodeList getElementsByClassName(String className) {
-    return _wrap(_ptr.getElementsByClassName(_unwrap(className)));
-  }
-
-  NodeList getElementsByTagName(String tagName) {
-    return _wrap(_ptr.getElementsByTagName(_unwrap(tagName)));
-  }
-
-  NodeList getElementsByTagNameNS(String namespaceURI, String localName) {
-    return _wrap(_ptr.getElementsByTagNameNS(_unwrap(namespaceURI), _unwrap(localName)));
-  }
-}