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

sql/sql.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'sql',
-      'type': 'static_library',
+      'type': '<(component)',
       'dependencies': [
         '../base/base.gyp:base',
         '../third_party/sqlite/sqlite.gyp:sqlite',
       ],
+      'defines': [ 'SQL_IMPLEMENTATION' ],
       'sources': [
         'connection.cc',
         'connection.h',
         'diagnostic_error_delegate.h',
         'init_status.h',
         'meta_table.cc',
         'meta_table.h',
         'statement.cc',
         'statement.h',
         'transaction.cc',
@@ skipping 25 matching lines @@
               'dependencies': [
                 '../base/allocator/allocator.gyp:allocator',
               ],
             }],
           ],
         }],
       ],
     },
   ],
 }