base: Add nullptr checks to logging.cc.

base/logging.cc

 // Copyright (c) 2012 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/logging.h"
 
 #include <limits.h>
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 844 matching lines @@
 #endif  // defined(OS_WIN)
 
 void CloseLogFile() {
 #if !defined(OS_WIN)
   LoggingLock logging_lock;
 #endif
   CloseLogFileUnlocked();
 }
 
 void RawLog(int level, const char* message) {
-  if (level >= g_min_log_level) {
+  if (level >= g_min_log_level && message) {
     size_t bytes_written = 0;
     const size_t message_len = strlen(message);
     int rv;
     while (bytes_written < message_len) {
       rv = HANDLE_EINTR(
           write(STDERR_FILENO, message + bytes_written,
                 message_len - bytes_written));
       if (rv < 0) {
         // Give up, nothing we can do now.
         break;
@@ skipping 32 matching lines @@
 #endif
 
 BASE_EXPORT void LogErrorNotReached(const char* file, int line) {
   LogMessage(file, line, LOG_ERROR).stream()
       << "NOTREACHED() hit.";
 }
 
 }  // namespace logging
 
 std::ostream& std::operator<<(std::ostream& out, const wchar_t* wstr) {
-  return out << base::WideToUTF8(wstr);
+  return out << (wstr ? base::WideToUTF8(wstr) : std::string());

[Mark Mentovai, 2016/03/10 18:06:54]

Your description only mentions RawLog(). Make it a little more generic to cover
this aspect of the change too.

 }