NaCl: Remove unused file string_encoding.cc

ppapi/native_client/src/trusted/plugin/plugin.gypi

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,  # Use higher warning level.
     'common_sources': [
       'file_downloader.cc',
       'json_manifest.cc',
       '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',
     ],
     # Append the arch-specific ISA code to common_sources.
     'conditions': [
       # Note: this test assumes that if this is not an ARM build, then this is
       # is an x86 build.  This is because |target_arch| for x86 can be one of a
       # number of values (x64, ia32, etc.).
       ['target_arch=="arm"', {
         'common_sources': [
           'arch_arm/sandbox_isa.cc',
@@ skipping 69 matching lines @@
         'link_settings': {
           'libraries': [
             '-lgdi32.lib',
             '-luser32.lib',
           ],
         },
       }],
     ],
   },
 }