Remove previous debug printing.

runtime/bin/file.cc

Index: runtime/bin/file.cc
diff --git a/runtime/bin/file.cc b/runtime/bin/file.cc
index 528b287695b89cf64efbfd16027a61e68713b074..e4548a51ec4903933bb6f3daa29a64d97660f5d5 100644
--- a/runtime/bin/file.cc
+++ b/runtime/bin/file.cc
@@ -256,21 +256,6 @@ void FUNCTION_NAME(File_WriteFrom)(Dart_NativeArguments args) {
       Dart_TypedDataAcquireData(buffer_obj, &type, &buffer, &buffer_len);
   if (Dart_IsError(result)) Dart_PropagateError(result);
 
-#ifdef DEBUG
-  // TODO(ajohnsen): Remove once issue 17602 is fixed.
-  bool print_debug = true;
-  for (int i = 0; i < length; i++) {
-    if (reinterpret_cast<uint8_t*>(buffer)[i] != 0xf3) {
-      print_debug = false;
-      break;
-    }
-  }
-  if (print_debug) {
-    fprintf(stderr, "WARNING: Data is purely 0x3f in File_WriteFrom\n");
-    fflush(stderr);
-  }
-#endif
-
   ASSERT(type == Dart_TypedData_kUint8 || type == Dart_TypedData_kInt8);
   ASSERT(end <= buffer_len);
   ASSERT(buffer != NULL);