[sqlite] Respect the gyp and gn component switch.

sql/proxy.h

-// Copyright 2015 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 SQL_PROXY_H_
-#define SQL_PROXY_H_
-
-#include "sql/sql_export.h"
-#include "third_party/sqlite/sqlite3.h"
-
-// TODO(shess): third_party/sqlite does not track component build correctly, so
-// each shared library gets a private copy of everything, so sqlite3_* calls
-// outside of the main sql/ component don't work right.  Hack around this by
-// adding pass-through functions while I land a separate fix for the component
-// issue.
-
-// This is only required for tests - if these abilities are desired for
-// production code, they should probably do obvious things like live in
-// sql::Connection and use C++ wrappers.
-
-// http://crbug.com/489444
-
-namespace sql {
-
-SQL_EXPORT int sqlite3_create_function_v2(
-    sqlite3 *db,
-    const char *zFunctionName,
-    int nArg,
-    int eTextRep,
-    void *pApp,
-    void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
-    void (*xStep)(sqlite3_context*,int,sqlite3_value**),
-    void (*xFinal)(sqlite3_context*),
-    void (*xDestroy)(void*));
-SQL_EXPORT void *sqlite3_commit_hook(sqlite3*, int(*)(void*), void*);
-
-}  // namespace sql
-
-#endif  // SQL_PROXY_H_