Inlining PPAPI_LIBS as its now the same everywhere.

ppapi/native_client/tests/ppapi_browser/ppb_file_system/nacl.scons

 # -*- python -*-
 # Copyright (c) 2012 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.
 #
 # This test uses ppapi_test_lib.
 
 Import('env')
 
 env.Prepend(CPPDEFINES=['XP_UNIX'])
 env.Replace(TEST_DIR='${SOURCE_ROOT}/ppapi/native_client/tests/ppapi_browser/' +
                      'ppb_file_system')
 
 nexe = env.ProgramNameForNmf('ppapi_ppb_file_system')
 env.Alias('ppapi_ppb_file_system${PROGSUFFIX}',
           ['$STAGING_DIR/%s${PROGSUFFIX}' % nexe])
 
 env.ComponentProgram(nexe,
                      ['ppapi_ppb_file_system.cc'],
-                     EXTRA_LIBS=['${PPAPI_LIBS}',
+                     EXTRA_LIBS=['ppapi',
                                  'ppapi_test_lib',
                                  'platform',
                                  'pthread',
                                  'gio'])
 
 env.Publish(nexe, 'run',
             ['ppapi_ppb_file_system.html',
              'ppapi_ppb_file_system.js'])
 
 node = env.PPAPIBrowserTester('ppapi_ppb_file_system_browser_test.out',
                               url='ppapi_ppb_file_system.html',
                               nmf_names=['ppapi_ppb_file_system'],
                               files=env.ExtractPublishedFiles(nexe))
 
 env.AddNodeToTestSuite(node,
                        ['chrome_browser_tests'],
                        'run_ppapi_ppb_file_system_browser_test',
                        is_broken=env.PPAPIBrowserTesterIsBroken())