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This reverts commit 1e24d20a.

Reason for revert: Tanks performance. Quad layers are apparently expensive, yo.

Original change's description:
> VR: Implement quad buffer for content quad.
> 
> Huge thanks to bajones for building the prototype I built this CL
> off of, and for debugging for me ;)
> 
> Uses a separate viewport with transform to avoid resampling the
> content quad when drawing it into our scene. The viewport is placed
> underneath the viewport for the other browser UI, and a transparent
> hole is punched through to the underlying viewport.
> 
> Also avoids toggling multisampling at runtime (which recreates the
> swap chain) by re-using the two buffers (one multisampled and one
> not) across browsing and webVR modes.
> 
> Bug: 714304
> 
> 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;master.tryserver.chromium.linux:linux_vr
> Change-Id: Ibcbb2752aaa957c3f904d4b76bf6dd5fdf9164c8
> Reviewed-on: https://chromium-review.googlesource.com/1017589
> Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
> Reviewed-by: Ian Vollick <vollick@chromium.org>
> Reviewed-by: Brandon Jones <bajones@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#552212}

TBR=vollick@chromium.org,mthiesse@chromium.org,bajones@chromium.org

Change-Id: Iea71c2d624193c5f90c7554ee212d28fb526bcfc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 714304
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;master.tryserver.chromium.linux:linux_vr
Reviewed-on: https://chromium-review.googlesource.com/1021972Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552333}