PPAPI: Remove threading options; it's always on

ppapi/proxy/locking_resource_releaser.h

Index: ppapi/proxy/locking_resource_releaser.h
diff --git a/ppapi/proxy/locking_resource_releaser.h b/ppapi/proxy/locking_resource_releaser.h
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+++ b/ppapi/proxy/locking_resource_releaser.h
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+// Copyright (c) 2013 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 PPAPI_PROXY_LOCKING_RESOURCE_RELEASER_H_
+#define PPAPI_PROXY_LOCKING_RESOURCE_RELEASER_H_
+
+#include "ppapi/shared_impl/ppapi_globals.h"
+#include "ppapi/shared_impl/proxy_lock.h"
+#include "ppapi/shared_impl/resource_tracker.h"
+
+namespace ppapi {
+namespace proxy {
+
+// LockingResourceReleaser is a simple RAII class for releasing a resource at
+// the end of scope. This acquires the ProxyLock before releasing the resource.
+// It is for use in unit tests. Most proxy or implementation code should use
+// ScopedPPResource instead. Unit tests sometimes can't use ScopedPPResource
+// because it asserts that the ProxyLock is already held.
+class LockingResourceReleaser {
+ public:
+  explicit LockingResourceReleaser(PP_Resource resource)
+      : resource_(resource) {
+  }
+  ~LockingResourceReleaser() {
+    ProxyAutoLock lock;
+    PpapiGlobals::Get()->GetResourceTracker()->ReleaseResource(resource_);
+  }
+
+  PP_Resource get() { return resource_; }
+
+ private:
+  PP_Resource resource_;
+
+  DISALLOW_COPY_AND_ASSIGN(LockingResourceReleaser);
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_LOCKING_RESOURCE_RELEASER_H_