Remove 'blink::WebSerializedOrigin' (6/6)

Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
@@ skipping 300 matching lines @@
       'exported/WebRTCStatsResponse.cpp',
       'exported/WebRTCVoidRequest.cpp',
       'exported/WebScrollbarImpl.cpp',
       'exported/WebScrollbarImpl.h',
       'exported/WebScrollbarThemeClientImpl.cpp',
       'exported/WebScrollbarThemeClientImpl.h',
       'exported/WebScrollbarThemeGeometryNative.cpp',
       'exported/WebScrollbarThemeGeometryNative.h',
       'exported/WebScrollbarThemePainter.cpp',
       'exported/WebSecurityOrigin.cpp',
-      'exported/WebSerializedOrigin.cpp',
       'exported/WebServicePortProviderClient.cpp',
       'exported/WebServiceWorkerProviderClient.cpp',
       'exported/WebServiceWorkerProxy.cpp',
       'exported/WebServiceWorkerRequest.cpp',
       'exported/WebServiceWorkerResponse.cpp',
       'exported/WebSocketHandshakeRequestInfo.cpp',
       'exported/WebSocketHandshakeResponseInfo.cpp',
       'exported/WebSourceInfo.cpp',
       'exported/WebSpeechSynthesisUtterance.cpp',
       'exported/WebSpeechSynthesisVoice.cpp',
@@ skipping 711 matching lines @@
       ['os_posix==1 and OS!="mac"',
         {
           'platform_test_files': [
             'text/LocaleICUTest.cpp',
           ],
         }
       ],
     ],
   },
 }