Remove PPB_Scrollbar_Dev and PPB_Widget_Dev from native client

ppapi/native_client/src/shared/ppapi_proxy/ppp_scrollbar.srpc

-# Copyright (c) 2011 The Native Client Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-# RPC methods used to implement PPP_Scrollbar calls to the plugin.
-# See ppapi/c/dev/ppp_scrollbar_dev.h for interface details.
-{
- 'name': 'PppScrollbarRpc',
- 'rpcs': [
-          {'name': 'PPP_Scrollbar_ValueChanged',
-           'inputs': [['instance', 'PP_Instance'],
-                      ['scrollbar', 'PP_Resource'],
-                      ['value', 'int32_t'],              # uint32_t
-                     ],
-           'outputs': [
-                      ]
-          },
-          {'name': 'PPP_Scrollbar_OverlayChanged',
-           'inputs': [['instance', 'PP_Instance'],
-                      ['scrollbar', 'PP_Resource'],
-                      ['overlay', 'int32_t'],              # PP_Bool
-                     ],
-           'outputs': [
-                      ]
-          },
-         ]
-}