Actually disable Wallet card saving on Linux.

components/autofill/core/browser/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # GYP version: components/autofill.gyp:autofill_regexes
 action("regexes") {
   visibility = [ "//components/autofill/*" ]
   script = "//build/escape_unicode.py"
 
   inputs = [
@@ skipping 124 matching lines @@
     "webdata/autofill_webdata_backend_impl.h",
     "webdata/autofill_webdata_service.cc",
     "webdata/autofill_webdata_service.h",
     "webdata/autofill_webdata_service_observer.h",
   ]
 
   # Compile the generated regex file.
   sources += get_target_outputs(":regexes")
 
   # Controls whether Wallet cards can be saved to the local instance of chrome.
-  if (is_desktop_linux) {
-    defines = [ "ENABLE_SAVE_WALLET_CARDS_LOCALLY=0" ]
-  } else {
-    defines = [ "ENABLE_SAVE_WALLET_CARDS_LOCALLY=1" ]
+  if (!is_desktop_linux) {
+    defines = [ "ENABLE_SAVE_WALLET_CARDS_LOCALLY" ]
   }
 
   deps = [
     ":regexes",
     "//base",
     "//base:i18n",
     "//base:prefs",
     "//components/autofill/core/common",
     "//components/infobars/core",
     "//components/keyed_service/core",
@@ skipping 111 matching lines @@
     "//sync",
     "//sync:test_support_sync_api",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/libphonenumber",
     "//third_party/libjingle",
     "//ui/base",
     "//url",
   ]
 }