[NaCl SDK] Get nacl_mounts_tests building.

native_client_sdk/src/libraries/nacl_mounts/mount.h

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef LIBRARIES_NACL_MOUNTS_MOUNT_H_
 #define LIBRARIES_NACL_MOUNTS_MOUNT_H_
 
 #include <map>
 #include <string>
 
@@ skipping 53 matching lines @@
  protected:
   // Device number for the mount.
   int dev_;
 
  private:
   // May only be called by the KernelProxy when the Kernel's
   // lock is held, so we make it private.
   friend class KernelObject;
   friend class KernelProxy;
   void Acquire() { RefObject::Acquire(); }
-  void Release() { RefObject::Release(); }
+  bool Release() { return RefObject::Release(); }
 
   template <class M, class P> friend class MountFactory;
   DISALLOW_COPY_AND_ASSIGN(Mount);
 };
 
 
 template<class C, class P> class MountFactory : public P {
- protected:
-  MountFactory()
-      : P() {}
-
+ public:
   static Mount* Create(int dev, StringMap_t& args) {
     Mount* mnt = new C();
     if (mnt->Init(dev, args) == false) {
       delete mnt;
       return NULL;
     }
     return mnt;
   }
 
-  friend class KernelProxy;
+ protected:
+  MountFactory(): P() {}
 };
 
 #endif  // LIBRARIES_NACL_MOUNTS_MOUNT_H_