Do not skip site import on python startup for v8 binding generation.

Source/bindings/modules/v8/generated.gyp

 # Copyright 2014 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.
 
 # Generate IDL bindings for modules, plus aggregate bindings files.
 #
 # Design doc: http://www.chromium.org/developers/design-documents/idl-build
 
 {
   'includes': [
@@ skipping 192 matching lines @@
       ],
       'outputs': [
         '<(bindings_modules_v8_output_dir)/V8<(RULE_INPUT_ROOT)Partial.cpp',
         '<(bindings_modules_v8_output_dir)/V8<(RULE_INPUT_ROOT)Partial.h',
       ],
       # sanitize-win-build-log.sed uses a regex which matches this command
       # line (Python script + .idl file being processed).
       # Update that regex if command line changes (other than changing flags)
       'action': [
         'python',
-        '-S',  # skip 'import site' to speed up startup
         '<(bindings_scripts_dir)/idl_compiler.py',
         '--cache-dir',
         '<(bindings_scripts_output_dir)',
         '--output-dir',
         '<(bindings_modules_v8_output_dir)',
         '--interfaces-info',
         '<(bindings_modules_output_dir)/InterfacesInfoModules.pickle',
         '--write-file-only-if-changed',
         '<(write_file_only_if_changed)',
         '--target-component',
@@ skipping 62 matching lines @@
       'bindings_modules_v8_generated_aggregate',
       'bindings_modules_v8_generated_individual',
       'bindings_modules_v8_generated_init_partial',
       'bindings_modules_v8_generated_partial_aggregate',
       'bindings_modules_v8_generated_partial_individual',
     ],
   },
 ################################################################################
   ],  # targets
 }