Remove generated directories with 100s of files.

client/dom/generated/src/frog/PerformanceTiming.dart

Index: client/dom/generated/src/frog/PerformanceTiming.dart
diff --git a/client/dom/generated/src/frog/PerformanceTiming.dart b/client/dom/generated/src/frog/PerformanceTiming.dart
deleted file mode 100644
index 08c0593d9271e525b5dee0c39e575f7c8f180f8c..0000000000000000000000000000000000000000
--- a/client/dom/generated/src/frog/PerformanceTiming.dart
+++ /dev/null
@@ -1,45 +0,0 @@
-
-class _PerformanceTimingJs extends _DOMTypeJs implements PerformanceTiming native "*PerformanceTiming" {
-
-  final int connectEnd;
-
-  final int connectStart;
-
-  final int domComplete;
-
-  final int domContentLoadedEventEnd;
-
-  final int domContentLoadedEventStart;
-
-  final int domInteractive;
-
-  final int domLoading;
-
-  final int domainLookupEnd;
-
-  final int domainLookupStart;
-
-  final int fetchStart;
-
-  final int loadEventEnd;
-
-  final int loadEventStart;
-
-  final int navigationStart;
-
-  final int redirectEnd;
-
-  final int redirectStart;
-
-  final int requestStart;
-
-  final int responseEnd;
-
-  final int responseStart;
-
-  final int secureConnectionStart;
-
-  final int unloadEventEnd;
-
-  final int unloadEventStart;
-}