It should be safe to never dlclose native EGL,
since we want to do it only when process exits,
in which case fd is closed and library destructor is called.

BUG=angleproject:1459

Change-Id: I8d3e5b323164d2f6473a083973f4d0adc9e655aa
Reviewed-on: https://chromium-review.googlesource.com/786051Reviewed-by: Frank Henigman <fjhenigman@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>