RefCounted types should not have public destructors, Linux fixes

remoting/host/policy_hack/nat_policy_linux.cc

 // 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.
 
 // Most of this code is copied from various classes in
 // src/chrome/browser/policy. In particular, look at
 //
 //   file_based_policy_loader.{h,cc}
 //   config_dir_policy_provider.{h,cc}
 //
@@ skipping 101 matching lines @@
         policy_watcher_->OnFilePathError(path);
       }
     }
 
     virtual void OnFilePathChanged(const FilePath& path) {
       if (policy_watcher_) {
         policy_watcher_->OnFilePathChanged(path);
       }
     }
 
+   protected:
+    virtual ~FilePathWatcherDelegate() {}
+
    private:
     base::WeakPtr<NatPolicyLinux> policy_watcher_;
   };
 
   base::Time GetLastModification() {
     DCHECK(OnPolicyThread());
     base::Time last_modification = base::Time();
     base::PlatformFileInfo file_info;
 
     // If the path does not exist or points to a directory, it's safe to load.
@@ skipping 133 matching lines @@
   base::WeakPtrFactory<NatPolicyLinux> weak_factory_;
 };
 
 NatPolicy* NatPolicy::Create(base::MessageLoopProxy* message_loop_proxy) {
   FilePath policy_dir(kPolicyDir);
   return new NatPolicyLinux(message_loop_proxy, policy_dir);
 }
 
 }  // namespace policy_hack
 }  // namespace remoting