Pepper: Change '*_sources' variables in ppapi_sources.gypi to '*_source_files'.

ppapi/ppapi_untrusted.gyp

 # 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.
 
 # This GYP file defines untrusted (NaCl) targets.  All targets in this
 # file should be conditionally depended upon via 'disable_nacl!=1' to avoid
 # requiring NaCl sources for building.
 
 {
   'includes': [
     '../native_client/build/untrusted.gypi',
     'ppapi_sources.gypi',
   ],
   'targets': [
     {
       'target_name': 'ppapi_cpp_lib',
       'type': 'none',
       'variables': {
         'nlib_target': 'libppapi_cpp.a',
         'build_glibc': 0,
         'build_newlib': 1,
         'sources': [
-          '<@(cpp_sources)',
+          '<@(cpp_source_files)',
           'cpp/module_embedder.h',
           'cpp/ppp_entrypoints.cc',
         ],
       },
       'dependencies': [
         '<(DEPTH)/native_client/tools.gyp:prep_toolchain',
       ],
     },
     {
       'target_name': 'ppapi_nacl_tests',
@@ skipping 17 matching lines @@
         ],
         'extra_deps64': [
           '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib64/libppapi_cpp.a',
           '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib64/libppapi.a',
         ],
         'extra_deps32': [
           '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib32/libppapi_cpp.a',
           '<(SHARED_INTERMEDIATE_DIR)/tc_newlib/lib32/libppapi.a',
         ],
         'sources': [
-          '<@(test_sources_common)',
-          '<@(test_sources_nacl)',
+          '<@(test_common_source_files)',
+          '<@(test_nacl_source_files)',
         ],
       },
     },
   ],
 }