This could cause invalid calls in the destructor in debug builds.

TRAC #22393

Signed-off-by: Geoff Lang
Signed-off-by: Daniel Koch
Author: Jamie Madill

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1712 736b8ea6-26fd-11df-bfd4-992fa37f6226