Reland of Enable WebVR for non component build (patchset #1 id:1 of https://codereview.chromium.org/2505963003/ )

Reason for revert:
Hi Andrew.
It turns out that our UX review is blocked on this. We need it in canary build. I will revert your revert for now. And I will work with you tomorrow to figure out if there is a way to reduce dex size of gvr. There should be enough time to land/merge these improvements before it hits stable.
Anyway, let's talk tomorrow. Thanks!

Original issue's description:
> Revert of Enable WebVR for non component build (patchset #5 id:80001 of https://codereview.chromium.org/2502643002/ )
>
> Reason for revert:
> Reverting until dex size growth is understood.
>
> Original issue's description:
> > Enable Android WebVR for arm & arm64
> >
> > BUG=644785
> >
> > Committed: https://crrev.com/7e31a518a02e80fa167181be029691d41fadb898
> > Cr-Commit-Position: refs/heads/master@{#432489}
>
> TBR=bshe@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=644785
>
> Committed: https://crrev.com/19ef7689f208ee3222539bf0bb1d4054b2dbf780
> Cr-Commit-Position: refs/heads/master@{#432606}

TBR=agrieve@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=644785

Review-Url: https://codereview.chromium.org/2505313002
Cr-Original-Commit-Position: refs/heads/master@{#432723}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: eabd2c4458bf716a84e060d3d80e3d931dfa69d7

config/features.gni

@@ -82,8 +82,7 @@ declare_args() {
   # Still requires command line flag to access API
   # TODO(bshe): Enable for other architecture too. Currently we only support arm
   # and arm64.
-  enable_webvr = is_android && is_component_build &&
-                 (current_cpu == "arm" || current_cpu == "arm64")
+  enable_webvr = is_android && (current_cpu == "arm" || current_cpu == "arm64")
 }
 
 # Additional dependent variables -----------------------------------------------