Source/autotools/symbols.filter

{
global:
  webkit_*;
  WebProcessMainGtk;
  NetworkProcessMain;
  _ZN6WebKit22WebGtkExtensionManager10initializeEPK14OpaqueWKBundlePKv;
  _ZN6WebKit22WebGtkExtensionManager6sharedEv;
local:
  webkit_media_player_debug;
  *;
};