Remove last client of sql::DiagnosticErrorDelegate.

sql/sql.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'sql',
       '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',
         'error_delegate_util.cc',
         'error_delegate_util.h',
         'init_status.h',
         'meta_table.cc',
         'meta_table.h',
         'statement.cc',
         'statement.h',
         'transaction.cc',
         'transaction.h',
       ],
@@ skipping 52 matching lines @@
           'variables': {
             'test_suite_name': 'sql_unittests',
             'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)sql_unittests<(SHARED_LIB_SUFFIX)',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }