Remove status:experimental for FontAccess feature

The blink runtime feature doesn't work by itself because the main
feature is implemented in Chromium.

Bug: 1121839
Change-Id: If66d1deb62d0d2cc0c6354c86729cd2472e1bca1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378751
Commit-Queue: Olivier Yiptong <oyiptong@chromium.org>
Auto-Submit: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Olivier Yiptong <oyiptong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802117}

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -822,7 +822,9 @@
     {
       name: "FontAccess",
       origin_trial_feature_name: "FontAccess",
-      status: "experimental",
+      // No status because this blink runtime feature doesn't work by itself.
+      // It's controlled by the corresponding Chromium feature which needs to
+      // be enabled to make the whole feature work.
     },
     {
       name: "FontSrcLocalMatching",