Enable "gn check" for //third_party/blink/renderer/modules/font_access

This directory has no errors now.
This CL has no behavior changes.

Bug: 800764
Change-Id: I84ec665b1e48e416ace523ac88b788cc1900b4d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412114
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Auto-Submit: Kent Tamura <tkent@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807328}

.gn

@@ -249,7 +249,6 @@ no_check_targets = [
   "//third_party/blink/renderer/core/workers:*",  # 289 errors
   "//third_party/blink/renderer/core/xmlhttprequest:*",  # 49 errors
   "//third_party/blink/renderer/core:*",  # 823 errors
-  "//third_party/blink/renderer/modules/font_access:*",  # 3 errors
   "//third_party/blink/renderer/modules/peerconnection:*",  # 43 errors
 
   "//third_party/breakpad:*",  # 34 errors