This reverts commit 226bba3c.

Reason for revert: Should no longer be needed after
https://chromium-review.googlesource.com/c/angle/angle/+/2168617

Original change's description:
> Add -Wno-pointer-to-int-cast
> 
> This is the last remaining instance of the warning across Chromium. It's
> fixed upstream but I can't seem to figure out how to successfully roll
> deqp. So suppressing it here for now.
> 
> This can be removed once the deqp in Angle has
> https://github.com/KhronosGroup/VK-GL-CTS/pull/199.
> 
> Change-Id: Ie954bb2a3d86ea0de644e2a78051531b396e88a8
> Bug: chromium:1054220
> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2165365
> Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
> Reviewed-by: Geoff Lang <geofflang@chromium.org>
> Commit-Queue: Geoff Lang <geofflang@chromium.org>

TBR=geofflang@chromium.org,courtneygo@google.com,aeubanks@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:1054220, angleproject:4588
Change-Id: Ib26534cbb48df6d51af137babb95f3aeb6825043
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2182891Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Commit-Queue: Nico Weber <thakis@chromium.org>