[Sync] Clean up intra-sync DEPS significantly.

components/sync/base/sync_string_conversions.h

Index: components/sync/base/sync_string_conversions.h
diff --git a/components/sync/base/sync_string_conversions.h b/components/sync/base/sync_string_conversions.h
deleted file mode 100644
index c9f8d544c55e894e90d0c808c06b693dd6840eb7..0000000000000000000000000000000000000000
--- a/components/sync/base/sync_string_conversions.h
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright 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.
-
-#ifndef COMPONENTS_SYNC_BASE_SYNC_STRING_CONVERSIONS_H_
-#define COMPONENTS_SYNC_BASE_SYNC_STRING_CONVERSIONS_H_
-
-#include "components/sync/core/connection_status.h"
-#include "components/sync/core/sync_encryption_handler.h"
-
-namespace syncer {
-
-const char* ConnectionStatusToString(ConnectionStatus status);
-
-// Returns the string representation of a PassphraseRequiredReason value.
-const char* PassphraseRequiredReasonToString(PassphraseRequiredReason reason);
-
-const char* PassphraseTypeToString(PassphraseType type);
-
-const char* BootstrapTokenTypeToString(BootstrapTokenType type);
-}  // namespace syncer
-
-#endif  // COMPONENTS_SYNC_BASE_SYNC_STRING_CONVERSIONS_H_