Disable noisy logging from net_url_request_fuzzer.

net/url_request/url_request_fuzzer.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/url_request/url_request.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 
+#include "base/logging.h"
 #include "base/run_loop.h"
 #include "base/test/fuzzed_data_provider.h"
 #include "net/base/request_priority.h"
 #include "net/socket/fuzzed_socket_factory.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_test_util.h"
 #include "url/gurl.h"
 
+struct Environment {
+  Environment() {
+    // Disable noisy logging as per "libFuzzer in Chrome" documentation:
+    // testing/libfuzzer/getting_started.md#Disable-noisy-error-message-logging.
+    logging::SetMinLogLevel(logging::LOG_FATAL);
+  }
+};
+
+Environment* env = new Environment();
+
 // Integration fuzzer for URLRequest's handling of HTTP requests. Can follow
 // redirects, both on the same server (using a new socket or the old one) and
 // across servers.
 // TODO(mmenke): Add support for testing HTTPS, auth, proxies, uploading,
 // cancelation, deferring reads / redirects, using preconnected sockets, SPDY,
 // QUIC, DNS failures (they all currently resolve to localhost), IPv6 DNS
 // results, URLs with IPs instead of hostnames (v4 and v6), etc.
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   base::FuzzedDataProvider data_provider(data, size);
   net::TestURLRequestContext url_request_context(true);
   net::FuzzedSocketFactory fuzzed_socket_factory(&data_provider);
   url_request_context.set_client_socket_factory(&fuzzed_socket_factory);
   url_request_context.Init();
 
   net::TestDelegate delegate;
 
   std::unique_ptr<net::URLRequest> url_request(
       url_request_context.CreateRequest(GURL("http://foo/"),
                                         net::DEFAULT_PRIORITY, &delegate));
   url_request->Start();
   // TestDelegate quits the message loop on completion.
   base::RunLoop().Run();
   return 0;
 }