Remove inheritance of chromium flags

tools/gyp/v8.gyp

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 {
   'variables': {
-    'chromium_code': 1,
     'msvs_use_common_release': 0,
     'gcc_version%': 'unknown',
     'target_arch%': 'ia32',
     'v8_use_snapshot%': 'true',
     'v8_regexp%': 'native',
   },
   'target_defaults': {
     'defines': [
       'ENABLE_LOGGING_AND_PROFILING',
       'ENABLE_DEBUGGER_SUPPORT',
@@ skipping 577 matching lines @@
       ],
       'conditions': [
         [ 'OS=="win"', {
           # This could be gotten by not setting chromium_code, if that's OK.
           'defines': ['_CRT_SECURE_NO_WARNINGS'],
         }],
       ],
     },
   ],
 }