Remove the explicit WebVR API dependency; it seems to be upstream now

demo/client/package.json

@@ -17,7 +17,6 @@
     "@types/opentype.js": "0.0.0",
     "@types/papaparse": "^4.1.33",
     "@types/webgl-ext": "0.0.29",
-    "@types/webvr-api": "0.0.31",
     "base64-js": "^1.2.3",
     "bootstrap": "^4.0.0",
     "gl-matrix": "^2.4.0",

demo/client/tsconfig.json

@@ -8,8 +8,7 @@
             "lodash",
             "node",
             "opentype.js",
-            "webgl-ext",
-            "webvr-api"
+            "webgl-ext"
         ],
         "typeRoots": [
             "node_modules/@types"