define OS_BSD on *BSD and replace the ifdefs to use that

base/debug/debugger_posix.cc

 // Copyright (c) 2011 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/debug/debugger.h"
 #include "build/build_config.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
@@ skipping 11 matching lines @@
 #endif
 
 #if defined(__GLIBCXX__)
 #include <cxxabi.h>
 #endif
 
 #if defined(OS_MACOSX)
 #include <AvailabilityMacros.h>
 #endif
 
-#if defined(OS_MACOSX) || defined(OS_OPENBSD) || defined(OS_FREEBSD)
+#if defined(OS_MACOSX) || defined(OS_BSD)
 #include <sys/sysctl.h>
 #endif
 
 #include <ostream>
 
 #include "base/basictypes.h"
 #include "base/eintr_wrapper.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/safe_strerror_posix.h"
 #include "base/string_piece.h"
 #include "base/stringprintf.h"
 
 #if defined(USE_SYMBOLIZE)
 #include "base/third_party/symbolize/symbolize.h"
 #endif
 
 #if defined(OS_ANDROID)
 #include "base/threading/platform_thread.h"
 #endif
 
 namespace base {
 namespace debug {
 
 bool SpawnDebuggerOnProcess(unsigned /* process_id */) {
   NOTIMPLEMENTED();
   return false;
 }
 
-#if defined(OS_MACOSX) || defined(OS_OPENBSD)
+#if defined(OS_MACOSX) || defined(OS_BSD)
 
 // Based on Apple's recommended method as described in
 // http://developer.apple.com/qa/qa2004/qa1361.html
 bool BeingDebugged() {
   // If the process is sandboxed then we can't use the sysctl, so cache the
   // value.
   static bool is_set = false;
   static bool being_debugged = false;
 
   if (is_set) {
@@ skipping 28 matching lines @@
   int sysctl_result = sysctl(mib, arraysize(mib), &info, &info_size, NULL, 0);
   DCHECK_EQ(sysctl_result, 0);
   if (sysctl_result != 0) {
     is_set = true;
     being_debugged = false;
     return being_debugged;
   }
 
   // This process is being debugged if the P_TRACED flag is set.
   is_set = true;
-#if defined(OS_OPENBSD)
+#if defined(OS_BSD)
   being_debugged = (info.p_flag & P_TRACED) != 0;
 #else
   being_debugged = (info.kp_proc.p_flag & P_TRACED) != 0;
 #endif
   return being_debugged;
 }
 
 #elif defined(OS_LINUX) || defined(OS_ANDROID)
 
 // We can look in /proc/self/status for TracerPid.  We are likely used in crash
@@ skipping 90 matching lines @@
 
 void BreakDebugger() {
   DEBUG_BREAK();
 #if defined(NDEBUG)
   _exit(1);
 #endif
 }
 
 }  // namespace debug
 }  // namespace base