Issue 5183 - remove synchronous FileSystem interface and stop exposing of DefaultFileSystem

libadblockplus.gyp

 {
   'conditions': [[
     # We don't want to use curl on Windows and Android, skip the check there
     'OS=="win" or OS=="android"',
     {
       'variables': {
         'have_curl': 0
       }
     },
     {
       'variables': {
         'have_curl': '<!(python check_curl.py)'
       }
     }
   ]],
   'includes': ['v8.gypi', 'shell/shell.gyp'],
   'targets': [{
     'target_name': 'libadblockplus',
     'type': '<(library)',
     'dependencies': ['<@(libv8_build_targets)'],
     'xcode_settings':{},
     'include_dirs': [
       'include',
       '<(libv8_include_dir)'
     ],
     'sources': [
       'include/AdblockPlus/ITimer.h',
       'include/AdblockPlus/IWebRequest.h',
       'include/AdblockPlus/IFileSystem.h',
-      'include/AdblockPlus/DefaultFileSystem.h',
       'src/AppInfoJsObject.cpp',
       'src/ConsoleJsObject.cpp',
       'src/DefaultLogSystem.cpp',
+      'src/DefaultFileSystem.h',
       'src/DefaultFileSystem.cpp',
       'src/DefaultTimer.cpp',
       'src/DefaultTimer.h',
       'src/DefaultWebRequest.h',
       'src/DefaultWebRequest.cpp',
       'src/FileSystemJsObject.cpp',
       'src/FilterEngine.cpp',
       'src/GlobalJsObject.cpp',
       'src/JsContext.cpp',
       'src/JsEngine.cpp',
@@ skipping 157 matching lines @@
       'test/WebRequest.cpp'
     ],
     'msvs_settings': {
       'VCLinkerTool': {
         'SubSystem': '1',   # Console
         'EntryPointSymbol': 'mainCRTStartup',
       },
     },
   }]
 }