gfx::LoadLibrary has been replaced in Chromium by base::LoadNativeLibrary.

Adding a local LoadLibrary function to wrap the new
call to base::LoadNativeLibrary and do the error handling.

Change-Id: Iaab23d3731508fbbf2dadb27d34c53fd65095830
Reviewed-by: Andras Becsi <andras.becsi@digia.com>