This reverts commit d3e0e84c.

Reason for revert: likely cause for crbug.com/922296

BUG=chromium:922296

Original change's description:
> Don't call Texture::onDestroy twice for the zero textures.
> 
> The BindingPointer will call onDestroy when all references are removed, no
> need to do it explicitly.
> 
> BUG=angleproject:3070
> 
> Change-Id: Ic5dd4da8f73e204d26d9d3a3c6e1eff9fded5411
> Reviewed-on: https://chromium-review.googlesource.com/c/1409868
> Reviewed-by: Jamie Madill <jmadill@chromium.org>
> Commit-Queue: Geoff Lang <geofflang@chromium.org>

TBR=geofflang@chromium.org,jmadill@chromium.org

Change-Id: I38097218d49940e7ac3ad914714294b019c154fd
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: angleproject:3070
Reviewed-on: https://chromium-review.googlesource.com/c/1413239Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>