Causing a failure in the end2end_test (in Debug):

ClearTest.ClearIssue/1

Renderer11::createRenderTarget returns unsupported when trying to create a BGR565 texture.

BUG=angleproject:1002

This reverts commit 72a31d66.

Change-Id: I9e052c78517abbcb22a678a949fdb81d6ba67eb7
Reviewed-on: https://chromium-review.googlesource.com/272543Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>