Move common PVer4 code into a V4ProtocolManagerUtil class.

components/safe_browsing_db.gypi

 # 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.
 
 {
   'targets': [
     {
       # GN version: //components/safe_browsing_db:safe_browsing_db_shared
       'target_name': 'safe_browsing_db_shared',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
         '../components/components.gyp:metrics',
         '../crypto/crypto.gyp:crypto',
         ':safebrowsing_proto',
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
         'safe_browsing_db/database_manager.h',
         'safe_browsing_db/database_manager.cc',
         'safe_browsing_db/hit_report.h',
         'safe_browsing_db/hit_report.cc',
         'safe_browsing_db/prefix_set.h',
         'safe_browsing_db/prefix_set.cc',
         'safe_browsing_db/util.h',
         'safe_browsing_db/util.cc',
+        'safe_browsing_db/v4_protocol_manager_util.h',
+        'safe_browsing_db/v4_protocol_manager_util.cc',
         'safe_browsing_db/v4_get_hash_protocol_manager.h',
         'safe_browsing_db/v4_get_hash_protocol_manager.cc',
       ],
       'include_dirs': [
         '..',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [4267, ],
     },
     {
@@ skipping 71 matching lines @@
         # Note: sources list duplicated in GN build.
         'safe_browsing_db/test_database_manager.h',
         'safe_browsing_db/test_database_manager.cc',
       ],
       'include_dirs': [
         '..',
       ],
     },
   ],
 }