Migrate WebVR Cardboard implementation to GVR

BUG=389343

Committed: https://crrev.com/267d5f909f25543d2351cc506626b5d5c08461c3
Review-Url: https://codereview.chromium.org/2219203002
Cr-Original-Commit-Position: refs/heads/master@{#413217}
Cr-Original-Original-Commit-Position: refs/heads/master@{#412710}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 7ab52ec35d497d6bb96c6a1fa36c9b123bc72330

config/features.gni

@@ -124,7 +124,9 @@ declare_args() {
 
   # Enable WebVR support by default on Android
   # Still requires command line flag to access API
-  enable_webvr = is_android
+  enable_webvr = is_android && is_component_build &&
+                 (current_cpu == "x86" || current_cpu == "x64" ||
+                  current_cpu == "arm" || current_cpu == "arm64")
 }
 
 # Additional dependent variables -----------------------------------------------