Remove generated directories with 100s of files.

client/html/generated/html/dartium/Blob.dart

Index: client/html/generated/html/dartium/Blob.dart
diff --git a/client/html/generated/html/dartium/Blob.dart b/client/html/generated/html/dartium/Blob.dart
deleted file mode 100644
index c144f97c753aa651df818dfc81ecde67e2f4355a..0000000000000000000000000000000000000000
--- a/client/html/generated/html/dartium/Blob.dart
+++ /dev/null
@@ -1,31 +0,0 @@
-
-class _BlobImpl extends _DOMTypeBase implements Blob {
-  _BlobImpl._wrap(ptr) : super._wrap(ptr);
-
-  int get size() => _wrap(_ptr.size);
-
-  String get type() => _wrap(_ptr.type);
-
-  Blob webkitSlice([int start = null, int end = null, String contentType = null]) {
-    if (start === null) {
-      if (end === null) {
-        if (contentType === null) {
-          return _wrap(_ptr.webkitSlice());
-        }
-      }
-    } else {
-      if (end === null) {
-        if (contentType === null) {
-          return _wrap(_ptr.webkitSlice(_unwrap(start)));
-        }
-      } else {
-        if (contentType === null) {
-          return _wrap(_ptr.webkitSlice(_unwrap(start), _unwrap(end)));
-        } else {
-          return _wrap(_ptr.webkitSlice(_unwrap(start), _unwrap(end), _unwrap(contentType)));
-        }
-      }
-    }
-    throw "Incorrect number or type of arguments";
-  }
-}