openbsd and freebsd fixes for base

base/threading/platform_thread_posix.cc

Index: base/threading/platform_thread_posix.cc
diff --git a/base/threading/platform_thread_posix.cc b/base/threading/platform_thread_posix.cc
index ee9b1b1ed7768e8e6fa7b2737a89edccf441ff46..d1fb7bbee88edc7118a37921c29da2644c87605c 100644
--- a/base/threading/platform_thread_posix.cc
+++ b/base/threading/platform_thread_posix.cc
@@ -132,11 +132,10 @@ PlatformThreadId PlatformThread::CurrentId() {
   return syscall(__NR_gettid);
 #elif defined(OS_ANDROID)
   return gettid();
-#elif defined(OS_FREEBSD)
-  // TODO(BSD): find a better thread ID
-  return reinterpret_cast<int64>(pthread_self());
 #elif defined(OS_NACL) || defined(OS_SOLARIS)
   return pthread_self();
+#elif defined(OS_POSIX)
+  return reinterpret_cast<int64>(pthread_self());
 #endif
 }