Modify ALLOW_UNUSED to allow enabling unused local warnings on MSVC.

ui/gl/generate_bindings.py

 #!/usr/bin/env python
 # 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.
 
 """code generator for GL/GLES extension wrangler."""
 
 import optparse
 import os
 import collections
@@ skipping 1503 matching lines @@
       file.write('  fn.%sFn = reinterpret_cast<%sProc>(%sNotBound);\n' %
           (func['known_as'], func['known_as'], func['known_as']))
 
   file.write('}\n')
   file.write('\n')
 
   # Write function to initialize bindings where choice of the function depends
   # on the extension string or the GL version.
   file.write("""void Driver%s::InitializeDynamicBindings(GLContext* context) {
   DCHECK(context && context->IsCurrent(NULL));
-  const GLVersionInfo* ver ALLOW_UNUSED = context->GetVersionInfo();
-  std::string extensions ALLOW_UNUSED = context->GetExtensions();
-  extensions += " ";
+  const GLVersionInfo* ver = context->GetVersionInfo();
+  ALLOW_UNUSED_LOCAL(ver);
+  std::string extensions = context->GetExtensions() + " ";
+  ALLOW_UNUSED_LOCAL(extensions);
 
 """ % set_name.upper())
   for extension in sorted(used_extensions):
     # Extra space at the end of the extension name is intentional, it is used
     # as a separator
     file.write('  ext.b_%s = extensions.find("%s ") != std::string::npos;\n' %
         (extension, extension))
 
   def WrapOr(cond):
     if ' || ' in cond:
@@ skipping 542 matching lines @@
 
   source_file = open(os.path.join(directory, 'gl_bindings_autogen_mock.cc'),
                      'wb')
   GenerateMockBindingsSource(source_file, GL_FUNCTIONS)
   source_file.close()
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))