Call the TextureD3D_2D::redefine member which will not make unnecessary
modifications to the image and lets the member serve as a callback for
redefined images.

BUG=angleproject:970

Change-Id: I511310ebfd4d6133219bbef82c53747f9454aee0
Reviewed-on: https://chromium-review.googlesource.com/293904Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>