Revert "VR: Adding move support for the platform UI"

This reverts commit d51d342022e6950032e02ad06c2aabb82c0a1c49.

Reason for revert: A DCHECK is failing on the bots, see bug 853388.

Original change's description:
> VR: Adding move support for the platform UI
> 
> This enables touch interaction with the web contents, effectively
> enabling long press, drag, selection, etc.
> 
> Context menu and selection handles are disabled for VR in this CL.
> 
> Bug: 842916, 733656, 848740
> 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;luci.chromium.try:linux_vr
> Change-Id: If50401ddbc130abde697b57d580bc492de2c4dda
> Reviewed-on: https://chromium-review.googlesource.com/1091281
> Commit-Queue: Aldo Culquicondor <acondor@chromium.org>
> Reviewed-by: Ted Choc <tedchoc@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Timothy Dresser <tdresser@chromium.org>
> Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#567745}

TBR=sky@chromium.org,mthiesse@chromium.org,jam@chromium.org,tedchoc@chromium.org,tdresser@chromium.org,acondor@chromium.org

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

Bug: 842916, 733656, 848740, 853388
Change-Id: I24b609f9c2c92efde74b53020a44907e0a30627e
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;luci.chromium.try:linux_vr
Reviewed-on: https://chromium-review.googlesource.com/1104217
Reviewed-by: Michael van Ouwerkerk <mvanouwerkerk@chromium.org>
Commit-Queue: Michael van Ouwerkerk <mvanouwerkerk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567965}
15 files changed