Extend the cros-ime flags expiry milestone.

Bug: 837156,937152
Change-Id: I1b7a61f929e40ae20d32295505e00b19c04b067b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208519
Commit-Queue: Leo Zhang <googleo@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770020}

chrome/browser/flag-metadata.json

@@ -1351,22 +1351,22 @@
   {
     "name": "enable-cros-ime-input-logic-fst",
     "owners": [ "essential-inputs-team@google.com" ],
-    "expiry_milestone": 85
+    "expiry_milestone": 90
   },
   {
     "name": "enable-cros-ime-input-logic-hmm",
     "owners": [ "essential-inputs-team@google.com" ],
-    "expiry_milestone": 85
+    "expiry_milestone": 90
   },
   {
     "name": "enable-cros-ime-input-logic-mozc",
     "owners": [ "essential-inputs-team@google.com" ],
-    "expiry_milestone": 86
+    "expiry_milestone": 90
   },
   {
     "name": "enable-cros-ime-mozc-proto",
     "owners": [ "essential-inputs-team@google.com" ],
-    "expiry_milestone": 85
+    "expiry_milestone": 90
   },
   {
     "name": "enable-cros-ime-native-decoder",