LPS-51898 ExecutingClassLoaders was introduced by LPS-5012 43a2e44f7ec23...

...bffedbb058f672860743a34bbaa to support LPS-5016 (see 94e73966a28a88bcbc666ab993c9d286d3b81bc7), but at LPS-5018 2ec03d54b3636ea419e7275a273ac8dc2d2ce97b this requirement got removed, however the ExecutingClassLoaders support was left in the system. Since no one is really using it, I am removing it to keep codebase clean

@mhan810 I ran into this while reviewing @zsigmondrab 's document about annotations https://docs.google.com/a/liferay.com/document/d/1ISeT1ik_IQAWNpet30m5Rk6AU-85hb7_-MUjsDJLNag

This is basically an used left over code, just letting you know this, in case you may want to keep it for any reason.