Reland of land: Enable Wallet metadata sync.

components/autofill/core/common/autofill_switches.cc

Index: components/autofill/core/common/autofill_switches.cc
diff --git a/components/autofill/core/common/autofill_switches.cc b/components/autofill/core/common/autofill_switches.cc
index 0bd07e07dd837fe841e87772aa235994e64207c3..79e8db41f4484d10706c1c377bace7c038a23f77 100644
--- a/components/autofill/core/common/autofill_switches.cc
+++ b/components/autofill/core/common/autofill_switches.cc
@@ -64,10 +64,6 @@
 const char kEnableSuggestionsWithSubstringMatch[] =
     "enable-suggestions-with-substring-match";
 
-// Enables syncing usage counts and last use dates of Wallet addresses and
-// cards.
-const char kEnableWalletMetadataSync[]      = "enable-wallet-metadata-sync";
-
 // Ignores autocomplete="off" for Autofill data (profiles + credit cards).
 const char kIgnoreAutocompleteOffForAutofill[] =
     "ignore-autocomplete-off-autofill";