Revert of SK_DECLARE_STATIC_MUTEX -> static SkMutex

src/ports/SkFontHost_fontconfig.cpp

 /*
  * Copyright 2008 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkFontConfigInterface.h"
 #include "SkFontMgr.h"
 #include "SkMutex.h"
 #include "SkRefCnt.h"
 
-static SkMutex gFontConfigInterfaceMutex;
+SK_DECLARE_STATIC_MUTEX(gFontConfigInterfaceMutex);
 static SkFontConfigInterface* gFontConfigInterface;
 
 SkFontConfigInterface* SkFontConfigInterface::RefGlobal() {
     SkAutoMutexAcquire ac(gFontConfigInterfaceMutex);
 
     return SkSafeRef(gFontConfigInterface);
 }
 
 SkFontConfigInterface* SkFontConfigInterface::SetGlobal(SkFontConfigInterface* fc) {
     SkAutoMutexAcquire ac(gFontConfigInterfaceMutex);
@@ skipping 11 matching lines @@
         return SkRef(gFontConfigInterface);
     }
     gFontConfigInterface = SkRef(SkFontConfigInterface::GetSingletonDirectInterface());
     return gFontConfigInterface;
 }
 
 SkFontMgr* SkFontMgr::Factory() {
     SkFontConfigInterface* fci = init_FCI();
     return fci ? SkFontMgr_New_FCI(fci) : nullptr;
 }