Revert "D3D11: Fix readback of BGRA-backed formats." This reverts commit 230d95616d1309914a6703e27a797a440806dd02. This broke GLES2ConformTest.GL2Tests_framebuffer_objects_input_run on the NVIDIA Win8 Chromium bots. BUG=chromium:620908 Change-Id: Idf6e3eb51483ff0b6bc758b95c5910863ddfc25f Reviewed-on: https://chromium-review.googlesource.com/353394 Reviewed-by: John Bauman <jbauman@chromium.org> Commit-Queue: John Bauman <jbauman@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>