Build nacl plugin with normal chromium warning levels (higher levels),

ppapi/native_client/src/shared/ppapi_proxy/ppapi_proxy.gyp

 # Copyright (c) 2012 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.
 
 {
+  'variables': {
+    'chromium_code': 1,  # Use higher warning level.
+  },
   'includes': [
     '../../../../../native_client/build/common.gypi',
   ],
+  'target_defaults': {
+    'conditions': [
+      ['OS=="linux"', {
+        'cflags!': [
+          '-Wno-unused-parameter', # be a bit stricter to match NaCl flags.
+        ],
+      }],
+      ['OS=="mac"', {
+        'cflags!': [
+          '-Wno-unused-parameter', # be a bit stricter to match NaCl flags.
+        ],
+      }],
+    ],
+  },
   'targets': [
     {
       'target_name': 'nacl_ppapi_browser',
       'type': 'static_library',
       'sources': [
         'browser_callback.cc',
         'browser_globals.cc',
         'browser_nacl_file_rpc_server.cc',
         'browser_ppb_audio_rpc_server.cc',
         'browser_ppb_audio_config_rpc_server.cc',
@@ skipping 52 matching lines @@
       'include_dirs': [
         '<(DEPTH)/ppapi/native_client/src/shared/ppapi_proxy/trusted',
         '<(DEPTH)/ppapi',
       ],
       'dependencies': [
         '<(DEPTH)/ppapi/ppapi.gyp:ppapi_c',
       ],
     },
   ],
 }