Bug 1318965 - Removes the custom AtomicRefCount r=cpearce

MozReview-Commit-ID: BAGocY4nGiM

--HG--
extra : rebase_source : 18562465c37b686ca1653862e5c4e096d9efefe9
extra : amend_source : ecc2ab9b15950c6291ea386004d82a67d5dde368

media/gmp-clearkey/0.1/RefCounted.h

@@ -21,41 +21,7 @@
 #include <assert.h>
 #include "ClearKeyUtils.h"
 
-#if defined(_MSC_VER)
 #include <atomic>
-typedef std::atomic<uint32_t> AtomicRefCount;
-#else
-class AtomicRefCount {
-public:
-  explicit AtomicRefCount(uint32_t aValue)
-    : mCount(aValue)
-    , mMutex(GMPCreateMutex())
-  {
-    assert(mMutex);
-  }
-  ~AtomicRefCount()
-  {
-    if (mMutex) {
-      mMutex->Destroy();
-    }
-  }
-  uint32_t operator--() {
-    AutoLock lock(mMutex);
-    return --mCount;
-  }
-  uint32_t operator++() {
-    AutoLock lock(mMutex);
-    return ++mCount;
-  }
-  operator uint32_t() {
-    AutoLock lock(mMutex);
-    return mCount;
-  }
-private:
-  uint32_t mCount;
-  GMPMutex* mMutex;
-};
-#endif
 
 // Note: Thread safe.
 class RefCounted {
@@ -81,7 +47,7 @@ protected:
   {
     assert(!mRefCount);
   }
-  AtomicRefCount mRefCount;
+  std::atomic<uint32_t> mRefCount;
 };
 
 template<class T>