Disable noisy logging for //net fuzz targets.

net/base/fuzzer_test_support.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 "base/at_exit.h"
 #include "base/i18n/icu_util.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/statistics_recorder.h"
 
 namespace {
 
 // Set up globals that a number of network tests use.
 //
 // Note that in general static initializers are not allowed, however this is
 // just being used by test code.
 struct InitGlobals {
   InitGlobals() {
     // Set up ICU. ICU is used internally by GURL, which is used throughout the
     // //net code. Initializing ICU is important to prevent fuzztests from
     // asserting when handling non-ASCII urls.
     CHECK(base::i18n::InitializeICU());
 
     // Prevent every call to get a Histogram* from leaking memory. Instead, only
     // the fist call to get each Histogram* leaks memory.
     base::StatisticsRecorder::Initialize();
+
+    // Disable noisy logging as per "libFuzzer in Chrome" documentation:
+    // testing/libfuzzer/getting_started.md#Disable-noisy-error-message-logging.
+    logging::SetMinLogLevel(logging::LOG_FATAL);
   }
 
   // A number of tests use async code which depends on there being a message
   // loop.  Setting one up here allows tests to reuse the message loop between
   // runs.
   base::MessageLoopForIO message_loop;
 
   base::AtExitManager at_exit_manager;
 };
 
 InitGlobals* init_globals = new InitGlobals();
 
 }  // namespace