Remove flag expiry for SadTabReload

The flag has been removed for a while, I forgot to remove the entry
when removing the flag.

Bug: none
Change-Id: I5c733e1e659f30b6f003b2879be08e80f15af99c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2460810
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Auto-Submit: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815089}

chrome/browser/flag-metadata.json

@@ -3927,11 +3927,6 @@
     // channels on devices which have no access to commandline flags.
     "expiry_milestone": -1
   },
-  {
-    "name": "reload-sad-tab",
-    "owners": [ "gambard", "bling-flags" ],
-    "expiry_milestone": 85
-  },
   {
     "name": "remote-copy-image-notification",
     "owners": [ "//chrome/browser/sharing/OWNERS" ],