Cleanup Mutex and related classes.

src/platform-solaris.cc

Index: src/platform-solaris.cc
diff --git a/src/platform-solaris.cc b/src/platform-solaris.cc
index b1d88af2939de69b8a4fc31a18786318a24af346..dd5c7a0d8483aac5e9ab5c78d7e180a2146e27b5 100644
--- a/src/platform-solaris.cc
+++ b/src/platform-solaris.cc
@@ -110,7 +110,7 @@ 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_guard(limit_mutex);
 
   lowest_ever_allocated = Min(lowest_ever_allocated, address);
   highest_ever_allocated =
@@ -479,7 +479,7 @@ void OS::SetUp() {
   // call this setup code within the same millisecond.
   uint64_t seed = static_cast<uint64_t>(TimeCurrentMillis());
   srandom(static_cast<unsigned int>(seed));
-  limit_mutex = CreateMutex();
+  limit_mutex = new Mutex();
 }