Revert "When GPU process falls back to SwiftShader, about:gpu displays an extra copy of data for real GPU."

This reverts commit ecc130cf2ee745b7f82e0373f0f162738e9d31be.

Reason for revert: Causes *-informational failures. See crbug.com/835343.

Original change's description:
> When GPU process falls back to SwiftShader, about:gpu displays an extra copy of data for real GPU.
> 
> BUG=828462
> TEST=manual in about:gpu
> R=​piman@chromium.org
> 
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
> Change-Id: I1a23827e504b2378762a59c46e23e730e9b2284e
> Reviewed-on: https://chromium-review.googlesource.com/1017300
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Commit-Queue: Zhenyao Mo <zmo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#552251}

TBR=sadrul@chromium.org,dcheng@chromium.org,zmo@chromium.org,kbr@chromium.org,piman@chromium.org

Change-Id: I41eea435995cff4ff1c7cb85d00a3bcbc919df3f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 828462
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/1022430
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#552414}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 38bd78a5a62b9f31635faa940c92e81c27680d1f
4 files changed