build sql as a component - this will help ensure there is only one copy

sql/diagnostic_error_delegate.h

 // Copyright (c) 2011 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_DIAGNOSTIC_ERROR_DELEGATE_H_
 #define SQL_DIAGNOSTIC_ERROR_DELEGATE_H_
 #pragma once
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "sql/connection.h"
+#include "sql/sql_export.h"
 
 namespace sql {
 
 // This class handles the exceptional sqlite errors that we might encounter
 // if for example the db is corrupted. Right now we just generate a UMA
 // histogram for release and an assert for debug builds.
 //
 // Why is it a template you ask? well, that is a funny story. The histograms
 // need to be singletons that is why they are always static at the function
 // scope, but we cannot use the Singleton class because they are not default
@@ skipping 19 matching lines @@
 
     // The histogram values from sqlite result codes go currently from 1 to
     // 26 currently but 50 gives them room to grow.
     UMA_HISTOGRAM_ENUMERATION(UniqueT::name(), error, 50);
   }
 };
 
 }  // namespace sql
 
 #endif  // SQL_DIAGNOSTIC_ERROR_DELEGATE_H_