Update fuzzer_test.gni: add seed_corpuses attribute into noop branch.

testing/libfuzzer/fuzzer_test.gni

Index: testing/libfuzzer/fuzzer_test.gni
diff --git a/testing/libfuzzer/fuzzer_test.gni b/testing/libfuzzer/fuzzer_test.gni
index 8f4ef6e296dc72239f421816ac5c54783562a583..014bb8f188cb6af69afcda16034446591340a695 100644
--- a/testing/libfuzzer/fuzzer_test.gni
+++ b/testing/libfuzzer/fuzzer_test.gni
@@ -155,6 +155,9 @@ template("fuzzer_test") {
     if (defined(invoker.seed_corpus)) {
       assert(invoker.seed_corpus == [] || invoker.seed_corpus != [])
     }
+    if (defined(invoker.seed_corpuses)) {
+      assert(invoker.seed_corpuses == [] || invoker.seed_corpuses != [])
+    }
     assert(!defined(invoker.check_includes) || invoker.check_includes != [])
     assert(!defined(invoker.include_dirs) || invoker.include_dirs != [])
     assert(!defined(invoker.defines) || invoker.defines != [])