chos-resize: remove resizable flag metadata

The flag code for the cros resizable vk has already been removed in a
prior cl (2413679). The flag metadata was missed in that CL and not
removed. This CL removes the flag metadata.

BUG=b:164919876

Change-Id: Ieba23324b31fc2019a6c0e3b154d50bdf24492e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2513847Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Curtis McMullan <curtismcmullan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823067}

chrome/browser/flag-metadata.json

@@ -1389,11 +1389,6 @@
     "owners": [ "essential-inputs-team@google.com" ],
     "expiry_milestone": 90
   },
-  {
-    "name": "enable-cros-virtual-keyboard-floating-resizable",
-    "owners": [ "essential-inputs-team@google.com" ],
-    "expiry_milestone": 85
-  },
   {
     "name": "enable-data-reduction-proxy-server-experiment",
     "owners": [ "//components/data_reduction_proxy/OWNERS" ],