[Sync] Clean up intra-sync DEPS significantly.

components/sync/base/sync_string_conversions.cc

-// Copyright (c) 2012 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.
-
-#include "components/sync/base/sync_string_conversions.h"
-
-#define ENUM_CASE(x) \
-  case x:            \
-    return #x
-
-namespace syncer {
-
-const char* ConnectionStatusToString(ConnectionStatus status) {
-  switch (status) {
-    ENUM_CASE(CONNECTION_OK);
-    ENUM_CASE(CONNECTION_AUTH_ERROR);
-    ENUM_CASE(CONNECTION_SERVER_ERROR);
-    default:
-      NOTREACHED();
-      return "INVALID_CONNECTION_STATUS";
-  }
-}
-
-// Helper function that converts a PassphraseRequiredReason value to a string.
-const char* PassphraseRequiredReasonToString(PassphraseRequiredReason reason) {
-  switch (reason) {
-    ENUM_CASE(REASON_PASSPHRASE_NOT_REQUIRED);
-    ENUM_CASE(REASON_ENCRYPTION);
-    ENUM_CASE(REASON_DECRYPTION);
-    default:
-      NOTREACHED();
-      return "INVALID_REASON";
-  }
-}
-
-const char* PassphraseTypeToString(PassphraseType type) {
-  switch (type) {
-    ENUM_CASE(IMPLICIT_PASSPHRASE);
-    ENUM_CASE(KEYSTORE_PASSPHRASE);
-    ENUM_CASE(FROZEN_IMPLICIT_PASSPHRASE);
-    ENUM_CASE(CUSTOM_PASSPHRASE);
-    default:
-      NOTREACHED();
-      return "INVALID_PASSPHRASE_TYPE";
-  }
-}
-
-const char* BootstrapTokenTypeToString(BootstrapTokenType type) {
-  switch (type) {
-    ENUM_CASE(PASSPHRASE_BOOTSTRAP_TOKEN);
-    ENUM_CASE(KEYSTORE_BOOTSTRAP_TOKEN);
-    default:
-      NOTREACHED();
-      return "INVALID_BOOTSTRAP_TOKEN_TYPE";
-  }
-}
-
-}  // namespace syncer