Clean up the file dev interfaces. The combination of some dev and some non

ppapi/ppapi_cpp.gypi

 # Copyright (c) 2011 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.
 
 {
   'targets': [
     {
       'target_name': 'ppapi_c<(nacl_ppapi_library_suffix)',
       'type': 'none',
       'all_dependent_settings': {
@@ skipping 174 matching lines @@
         'cpp/dev/buffer_dev.cc',
         'cpp/dev/buffer_dev.h',
         'cpp/dev/context_3d_dev.cc',
         'cpp/dev/context_3d_dev.h',
         'cpp/dev/directory_entry_dev.cc',
         'cpp/dev/directory_entry_dev.h',
         'cpp/dev/directory_reader_dev.cc',
         'cpp/dev/directory_reader_dev.h',
         'cpp/dev/file_chooser_dev.cc',
         'cpp/dev/file_chooser_dev.h',
-        'cpp/dev/file_io_dev.cc',
         'cpp/dev/file_io_dev.h',
-        'cpp/dev/file_ref_dev.cc',
         'cpp/dev/file_ref_dev.h',
-        'cpp/dev/file_system_dev.cc',
         'cpp/dev/file_system_dev.h',
         'cpp/dev/find_dev.cc',
         'cpp/dev/find_dev.h',
         'cpp/dev/font_dev.cc',
         'cpp/dev/font_dev.h',
         'cpp/dev/fullscreen_dev.cc',
         'cpp/dev/fullscreen_dev.h',
         'cpp/dev/graphics_3d_client_dev.cc',
         'cpp/dev/graphics_3d_client_dev.h',
         'cpp/dev/graphics_3d_dev.cc',
@@ skipping 75 matching lines @@
         }],
         ['OS=="mac"', {
           'xcode_settings': {
             'WARNING_CFLAGS': ['-Wextra', '-pedantic'],
            },
         }]
       ],
     },
   ],
 }