Update Lighting Estimation OT Token

The current token expired on December 29th, and should be updated.

Change-Id: Ia7dbcd367b5bb0ba6b536b0bd44fba5039fbaa19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611688
Auto-Submit: Alexander Cooper <alcooper@chromium.org>
Commit-Queue: Piotr Bialecki <bialpio@chromium.org>
Reviewed-by: Piotr Bialecki <bialpio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840321}

third_party/webxr_test_pages/webxr-samples/proposals/lighting-estimation.html

@@ -27,7 +27,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     <meta name='mobile-web-app-capable' content='yes'>
     <meta name='apple-mobile-web-app-capable' content='yes'>
 
-    <meta http-equiv="origin-trial" data-expires="2020-12-29" content="AhFJp7RFfvuQzvUzm2kjagna4L0VlVOlX7AR/M1/uyG5E9SpAPzGqQ7XxHrR3+UbOEjWEJ9fMtpkHMaXKf+OAQsAAABkeyJvcmlnaW4iOiJodHRwczovL3N0b3JhZ2UuZ29vZ2xlYXBpcy5jb206NDQzIiwiZmVhdHVyZSI6IldlYlhSTGlnaHRFc3RpbWF0aW9uIiwiZXhwaXJ5IjoxNjA5MjgyODIwfQ==">
+    <meta http-equiv="origin-trial" data-expires="2021-02-16" content="AsJ99WEM5bgoOEDTva9eWNnhIwCkDnYPf2Mu0y/TGocIZSFVDzr6CLe4uqQajojLFmxFhfvyexBYUGVW5hWalwsAAABkeyJvcmlnaW4iOiJodHRwczovL3N0b3JhZ2UuZ29vZ2xlYXBpcy5jb206NDQzIiwiZmVhdHVyZSI6IldlYlhSTGlnaHRFc3RpbWF0aW9uIiwiZXhwaXJ5IjoxNjEzNDk4MzgwfQ==">
     <link href='../css/common.css' rel='stylesheet'>
 
     <!--The polyfill is not needed for browser that have native API support,