[protosync] Server-side -> client

Sync changes from https://critique.corp.google.com/#review/277300793
to client side.

Change-Id: Ife0ce7048700f84879bb2c978fe8e251c378b79c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910223Reviewed-by: Alexander Hendrich <hendrich@chromium.org>
Commit-Queue: Jit Yao Yap <jityao@google.com>
Cr-Commit-Position: refs/heads/master@{#714451}

components/policy/proto/chrome_device_policy.proto

@@ -1578,7 +1578,7 @@ message ChromeDeviceSettingsProto {
   optional LoginScreenLocalesProto login_screen_locales = 49;
   optional LoginScreenInputMethodsProto login_screen_input_methods = 50;
   optional DeviceEcryptfsMigrationStrategyProto
-      device_ecryptfs_migration_strategy = 51;
+      device_ecryptfs_migration_strategy = 51 [deprecated = true];
   optional DeviceSecondFactorAuthenticationProto
       device_second_factor_authentication = 52;
   optional CastReceiverNameProto cast_receiver_name = 53;