Add a BrotliSourceStream fuzzer

net/filter/gzip_source_stream_fuzzer.cc

Index: net/filter/gzip_source_stream_fuzzer.cc
diff --git a/net/filter/gzip_source_stream_fuzzer.cc b/net/filter/gzip_source_stream_fuzzer.cc
index e380ca7f0179a59ca3e2d71c93234369aa7d45d9..4d1d7f097b7fd1bb5b8727e4e1c54b78330f0078 100644
--- a/net/filter/gzip_source_stream_fuzzer.cc
+++ b/net/filter/gzip_source_stream_fuzzer.cc
@@ -13,7 +13,7 @@
 
 // Fuzzer for GzipSourceStream.
 //
-// |data| is used to create a FuzzedSocket.
+// |data| is used to create a FuzzedSourceStream.
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   net::TestCompletionCallback callback;
   base::FuzzedDataProvider data_provider(data, size);