chromeos: Remove unused method in virtual_machines_util.h

The method isn't defined, just declared. Remove the declaration.

Change-Id: Ic83c827fe37f39a34802b16f39251e422a48e989
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505442
Commit-Queue: James Cook <jamescook@chromium.org>
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Auto-Submit: James Cook <jamescook@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821951}

chrome/browser/chromeos/virtual_machines/virtual_machines_util.h

@@ -11,10 +11,6 @@ namespace virtual_machines {
 // per enterprise policy.
 bool AreVirtualMachinesAllowedByPolicy();
 
-// Whether running virtual machines on Chrome OS is allowed per hard-coded
-// release schedule.
-bool AreVirtualMachinesAllowedByVersionAndChannel();
-
 }  // namespace virtual_machines
 
 #endif  // CHROME_BROWSER_CHROMEOS_VIRTUAL_MACHINES_VIRTUAL_MACHINES_UTIL_H_