Remove generated directories with 100s of files.

client/html/generated/html/dartium/FileReaderSync.dart

Index: client/html/generated/html/dartium/FileReaderSync.dart
diff --git a/client/html/generated/html/dartium/FileReaderSync.dart b/client/html/generated/html/dartium/FileReaderSync.dart
deleted file mode 100644
index 982c8583d5e1707c8a5371b114fb93d166f3e0e4..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/FileReaderSync.dart
+++ /dev/null
@@ -1,24 +0,0 @@
-
-class _FileReaderSyncImpl extends _DOMTypeBase implements FileReaderSync {
-  _FileReaderSyncImpl._wrap(ptr) : super._wrap(ptr);
-
-  ArrayBuffer readAsArrayBuffer(Blob blob) {
-    return _wrap(_ptr.readAsArrayBuffer(_unwrap(blob)));
-  }
-
-  String readAsBinaryString(Blob blob) {
-    return _wrap(_ptr.readAsBinaryString(_unwrap(blob)));
-  }
-
-  String readAsDataURL(Blob blob) {
-    return _wrap(_ptr.readAsDataURL(_unwrap(blob)));
-  }
-
-  String readAsText(Blob blob, [String encoding = null]) {
-    if (encoding === null) {
-      return _wrap(_ptr.readAsText(_unwrap(blob)));
-    } else {
-      return _wrap(_ptr.readAsText(_unwrap(blob), _unwrap(encoding)));
-    }
-  }
-}