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

ppapi/ppapi_tests.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_example',
       'dependencies': [
         'ppapi.gyp:ppapi_cpp'
@@ skipping 46 matching lines @@
       #  }],
       #],
     },
     {
       'target_name': 'ppapi_tests',
       'type': 'loadable_module',
       'include_dirs': [
         'lib/gl/include',
       ],
       'sources': [
-        '<@(test_sources_common)',
-        '<@(test_sources_trusted)',
+        '<@(test_common_source_files)',
+        '<@(test_trusted_source_files)',
       ],
       'dependencies': [
         'ppapi.gyp:ppapi_cpp',
         'ppapi_internal.gyp:ppapi_shared',
       ],
       'run_as': {
         'action': [
           '<(PRODUCT_DIR)/<(EXECUTABLE_PREFIX)chrome<(EXECUTABLE_SUFFIX)',
           '--enable-pepper-testing',
           '--enable-accelerated-plugins',
@@ skipping 264 matching lines @@
       ],
       'include_dirs': [
         'lib/gl/include',
       ],
       'sources': [
         'examples/video_capture/video_capture.cc',
       ],
     },
   ],
 }