Enable SyncTriggerFullKeystoreMigration by default

Bug: 1094326
Change-Id: I1cc440f13b92fc825cc749c042e8599fdab793c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2455447
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Auto-Submit: Maksim Moskvitin <mmoskvitin@google.com>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814665}

components/sync/engine/sync_engine_switches.cc

@@ -21,6 +21,6 @@ const base::Feature kSyncSupportTrustedVaultPassphrase{
     "SyncSupportTrustedVaultPassphrase", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kSyncTriggerFullKeystoreMigration{
-    "SyncTriggerFullKeystoreMigration", base::FEATURE_DISABLED_BY_DEFAULT};
+    "SyncTriggerFullKeystoreMigration", base::FEATURE_ENABLED_BY_DEFAULT};
 
 }  // namespace switches