[CrOS MultiDevice] Extend CryptAuth flags

These flags were set to expire in M-86, but they need to be extended
since clients have not yet been fully switched to v2.

Bug: 1121385
Change-Id: I4f54eac75e8e951676cbc654a3672c799f92160c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2373444
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Josh Nohle <nohle@chromium.org>
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Josh Nohle <nohle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801229}

chrome/browser/flag-metadata.json

@@ -719,17 +719,17 @@
   {
     "name": "cryptauth-v2-device-activity-status",
     "owners": [ "khorimoto", "nohle", "themaxli" ],
-    "expiry_milestone": 86
+    "expiry_milestone": 89
   },
   {
     "name": "cryptauth-v2-devicesync",
     "owners": [ "khorimoto", "nohle" ],
-    "expiry_milestone": 86
+    "expiry_milestone": 89
   },
   {
     "name": "cryptauth-v2-enrollment",
     "owners": [ "khorimoto", "nohle" ],
-    "expiry_milestone": 86
+    "expiry_milestone": 89
   },
   {
     "name": "cups-ipp-printing-backend",
@@ -854,7 +854,7 @@
   {
     "name": "disable-cryptauth-v1-devicesync",
     "owners": [ "khorimoto", "nohle" ],
-    "expiry_milestone": 87
+    "expiry_milestone": 90
   },
   {
     "name": "disable-experimental-accessibility-chromevox-language-switching",