[inspector] fixed all shorten-64-to-32 warnings

src/v8.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 1732 matching lines @@
           'sources': [
             '<@(inspector_all_sources)'
           ],
           'dependencies': [
             'inspector/inspector.gyp:protocol_generated_sources',
             'inspector/inspector.gyp:inspector_injected_script',
             'inspector/inspector.gyp:inspector_debugger_script',
           ],
           # TODO(dgozman): fix these warnings and enable them.
           'msvs_disabled_warnings': [
-            4267,  # Truncation from size_t to int.
             4305,  # Truncation from 'type1' to 'type2'.
             4324,  # Struct padded due to declspec(align).
             4714,  # Function marked forceinline not inlined.
             4800,  # Value forced to bool.
           ],
           'cflags': [
-            '-Wno-shorten-64-to-32',
           ],
         }],
         ['OS=="win" and v8_enable_i18n_support==1', {
           'dependencies': [
             '<(icu_gyp_path):icudata',
           ],
         }],
       ],
     },
     {
@@ skipping 676 matching lines @@
       'conditions': [
         ['want_separate_host_toolset_mkpeephole==1', {
           'toolsets': ['host'],
         }, {
           'toolsets': ['target'],
         }],
       ],
     },
   ],
 }