Cleanup Mutex and related classes.

src/platform-openbsd.cc

Index: src/platform-openbsd.cc
diff --git a/src/platform-openbsd.cc b/src/platform-openbsd.cc
index e59160109f0fbfc7c6ab0b6fd6b088ae0bc3dd1f..495220591a6a7de9f421c7776aa2a32b42889bed 100644
--- a/src/platform-openbsd.cc
+++ b/src/platform-openbsd.cc
@@ -93,7 +93,7 @@ static void* highest_ever_allocated = reinterpret_cast<void*>(0);
 
 static void UpdateAllocatedSpaceLimits(void* address, int size) {
   ASSERT(limit_mutex != NULL);
-  ScopedLock lock(limit_mutex);
+  LockGuard<Mutex> lock(limit_mutex);
 
   lowest_ever_allocated = Min(lowest_ever_allocated, address);
   highest_ever_allocated =
@@ -502,7 +502,7 @@ void OS::SetUp() {
   // Seed the random number generator. We preserve microsecond resolution.
   uint64_t seed = Ticks() ^ (getpid() << 16);
   srandom(static_cast<unsigned int>(seed));
-  limit_mutex = CreateMutex();
+  limit_mutex = new Mutex();
 }