cleanup patch generation to preseve comments and remove @patch

test/dart_codegen/expect/async/timer.dart

Index: test/dart_codegen/expect/async/timer.dart
diff --git a/test/dart_codegen/expect/async/timer.dart b/test/dart_codegen/expect/async/timer.dart
index 74c8583ad362376cbc438bc05ddc34a996b96693..c0bd9c9726bbc026ddb186ccd40d774eb2725b13 100644
--- a/test/dart_codegen/expect/async/timer.dart
+++ b/test/dart_codegen/expect/async/timer.dart
@@ -27,19 +27,19 @@ abstract class Timer {
   }
   void cancel();
   bool get isActive;
-  @patch static Timer _createTimer(Duration duration, void callback()) {
+  static Timer _createTimer(Duration duration, void callback()) {
     int milliseconds = duration.inMilliseconds;
     if (milliseconds < 0) milliseconds = 0;
     return ((__x131) => DDC$RT.cast(__x131, dynamic, Timer, "CastExact",
-        """line 111, column 12 of dart:async/timer.dart: """, __x131 is Timer,
+        """line 110, column 12 of dart:async/timer.dart: """, __x131 is Timer,
         true))(new TimerImpl(milliseconds, callback));
   }
-  @patch static Timer _createPeriodicTimer(
+  static Timer _createPeriodicTimer(
       Duration duration, void callback(Timer timer)) {
     int milliseconds = duration.inMilliseconds;
     if (milliseconds < 0) milliseconds = 0;
     return ((__x132) => DDC$RT.cast(__x132, dynamic, Timer, "CastExact",
-        """line 118, column 12 of dart:async/timer.dart: """, __x132 is Timer,
+        """line 116, column 12 of dart:async/timer.dart: """, __x132 is Timer,
         true))(new TimerImpl.periodic(milliseconds, callback));
   }
 }