Causing a build conflig with Chromium's DISALLOW_COPY_AND_ASSIGN.

http://build.chromium.org/p/chromium.gpu.fyi/builders/GPU%20Win%20Builder/builds/24738

This reverts commit 3ad467df.

Change-Id: I0cf13e3bc3af90303a123813052cced0ba086515
Reviewed-on: https://chromium-review.googlesource.com/263159Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>