NaCl: Remove unused file string_encoding.cc

ppapi/native_client/src/trusted/plugin/build.scons

 # -*- python -*-
 # Copyright (c) 2011 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.
 
 # TODO(polina): for Mac build check if no longer need .r files and/or document
 # target browsers for each bundle target.
 
 Import('env')
 
@@ skipping 50 matching lines @@
     'module_ppapi.cc',
     'nacl_subprocess.cc',
     'nexe_arch.cc',
     'plugin.cc',
     'pnacl_coordinator.cc',
     'pnacl_resources.cc',
     'scriptable_plugin.cc',
     'service_runtime.cc',
     'srpc_client.cc',
     'srpc_params.cc',
-    'string_encoding.cc',
     'utility.cc',
 ]
 
 if env.Bit('target_x86'):
   common_inputs += ['arch_x86/sandbox_isa.cc']
 elif env.Bit('target_arm'):
   common_inputs += ['arch_arm/sandbox_isa.cc']
 else:
   # Unrecognized architecture - this is a build failure.
   print "Unrecognized architecture: %s" % env['TARGET_ARCHITECTURE']
@@ skipping 112 matching lines @@
                                     unittest_sources,
                                     no_import_lib=True)
   node = env.CommandTest('ppapi_plugin_unittest.out',
                          command=[unittest,
                                   ppapi_plugin,
                                   env['BUILD_ISA_NAME']])
   env.AddNodeToTestSuite(node, ['small_tests'], 'run_ppapi_plugin_unittest')
 
 
 # TODO(polina,sehr): add a test for the PPAPI plugin on ARM.