[PPAPI] Moving pp::VarResource_Dev API into pp::Var (now stable).

ppapi/api/dev/ppb_var_resource_dev.idl

-/* Copyright 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.
- */
-
-/**
- * This file defines the <code>PPB_VarResource</code> struct providing
- * a way to interact with resource vars.
- */
-
-label Chrome {
-  M32 = 0.1
-};
-
-[macro="PPB_VAR_RESOURCE_DEV_INTERFACE"]
-interface PPB_VarResource_Dev {
-  /**
-   * Converts a resource-type var to a <code>PP_Resource</code>.
-   *
-   * @param[in] var A <code>PP_Var</code> struct containing a resource-type var.
-   *
-   * @return A <code>PP_Resource</code> retrieved from the var, or 0 if the var
-   * is not a resource. The reference count of the resource is incremented on
-   * behalf of the caller.
-   */
-  PP_Resource VarToResource([in] PP_Var var);
-
-  /**
-   * Creates a new <code>PP_Var</code> from a given resource.
-   *
-   * @param[in] resource A <code>PP_Resource</code> to be wrapped in a var.
-   *
-   * @return A <code>PP_Var</code> created for this resource, with type
-   * <code>PP_VARTYPE_RESOURCE</code>. The reference count of the var is set to
-   * 1 on behalf of the caller.
-   */
-  PP_Var VarFromResource([in] PP_Resource resource);
-};