Remove PPB_Scrollbar_Dev and PPB_Widget_Dev from native client

ppapi/native_client/src/shared/ppapi_proxy/build.scons

 # -*- python -*-
 # 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.
 
 import os
 
 Import('env')
 
 # To get generated include files.
@@ skipping 39 matching lines @@
                  'browser_ppb_host_resolver_private_rpc_server.cc',
                  'browser_ppb_image_data_rpc_server.cc',
                  'browser_ppb_input_event_rpc_server.cc',
                  'browser_ppb_instance_rpc_server.cc',
                  'browser_ppb_messaging_rpc_server.cc',
                  'browser_ppb_mouse_cursor_rpc_server.cc',
                  'browser_ppb_mouse_lock_rpc_server.cc',
                  'browser_ppb_net_address_private_rpc_server.cc',
                  'browser_ppb_network_list_private_rpc_server.cc',
                  'browser_ppb_network_monitor_private_rpc_server.cc',
-                 'browser_ppb_pdf_rpc_server.cc',
                  'browser_ppb_rpc_server.cc',
-                 'browser_ppb_scrollbar_rpc_server.cc',
                  'browser_ppb_tcp_server_socket_private_rpc_server.cc',
                  'browser_ppb_tcp_socket_private_rpc_server.cc',
                  'browser_ppb_testing_rpc_server.cc',
                  'browser_ppb_udp_socket_private_rpc_server.cc',
                  'browser_ppb_url_loader_rpc_server.cc',
                  'browser_ppb_url_request_info_rpc_server.cc',
                  'browser_ppb_url_response_info_rpc_server.cc',
                  'browser_ppb_websocket_rpc_server.cc',
-                 'browser_ppb_widget_rpc_server.cc',
                  'browser_ppb_zoom_rpc_server.cc',
                  'browser_ppp_find.cc',
                  'browser_ppp_input_event.cc',
                  'browser_ppp_instance.cc',
                  'browser_ppp_messaging.cc',
                  'browser_ppp_mouse_lock.cc',
                  'browser_ppp_printing.cc',
-                 'browser_ppp_scrollbar.cc',
                  'browser_ppp_selection.cc',
-                 'browser_ppp_widget.cc',
                  'browser_ppp_zoom.cc',
                  'browser_ppp.cc',
                  'browser_upcall.cc',
                  'input_event_data.cc',
                  'object_serialize.cc',
                  # Autogenerated files
                  'ppb_rpc_server.cc',
                  'ppp_rpc_client.cc',
                  'upcall_server.cc',
                  'view_data.cc',
                  common_obj,])
 
 
 # The PPAPI RPCs are specified abstractly via .srpc files.
 # Add new .srpc files to the appropriate list in run_srpcgen.py
 # and then run that script.
 # The .cc files are written to ./ and .h files to ./{un,}trusted/srpcgen/.
 # The generated files must be committed when changes are made to .srpc files.
 #
 # run_srpcgen.py --diff_mode verifies that these files are not out of date.