Revert of Migrate WebVR Cardboard implementation to GVR (patchset #20 id:380001 of https://codereview.chromium.org/2219203002/ )

Reason for revert:
Android build failure on cronet:
https://build.chromium.org/p/chromium.android/builders/Android%20Cronet%20MIPS%20Builder/builds/4131

/b/build/slave/Android_Cronet_MIPS_Builder/build/src/buildtools/linux64/gn gen //out/Release --check
  -> returned 1
ERROR at //third_party/gvr-android-sdk/BUILD.gn:27:1: Empty sources for copy command.
copy("libgvr_shared_library") {
^------------------------------
You have to specify at least one file to copy in the "sources".
See //device/vr/BUILD.gn:47:7: which caused the file to be included.
      "//third_party/gvr-android-sdk:libgvr",
      ^-------------------------------------
GN gen failed: 1
step returned non-zero exit code: 1

Also suspect but have not confirmed causing these two build failures:
https://build.chromium.org/p/chromium.android/builders/Android%20arm64%20Builder%20%28dbg%29/builds/7419
https://build.chromium.org/p/chromium.android/builders/Android%20x64%20Builder%20%28dbg%29/builds/7722

Original issue's description:
> Migrate WebVR Cardboard implementation to GVR
>
> BUG=389343
>
> Committed: https://crrev.com/267d5f909f25543d2351cc506626b5d5c08461c3
> Cr-Commit-Position: refs/heads/master@{#412710}

TBR=dtrainor@chromium.org,girard@chromium.org,bshe@chromium.org,mthiesse@chromium.org,klausw@google.com,sievers@chromium.org,bajones@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=389343

Review-Url: https://codereview.chromium.org/2258513003
Cr-Commit-Position: refs/heads/master@{#412724}
24 files changed