Revert of Move prefix_set and parts of s_b_util into a new component safe_browsing_db.

chrome/chrome_tests_unit.gypi

 # Copyright 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': {
     'chrome_unit_tests_sources': [
       # histograms.xml is analyzed by AboutFlagsHistogramTest, so this
       # dependency is needed to make commit bots run unit_tests on
       # histograms.xml changes.
       '../tools/metrics/histograms/histograms.xml',
@@ skipping 980 matching lines @@
       'browser/safe_browsing/incident_reporting/platform_state_store_unittest.cc',
       'browser/safe_browsing/incident_reporting/platform_state_store_win_unittest.cc',
       'browser/safe_browsing/incident_reporting/preference_validation_delegate_unittest.cc',
       'browser/safe_browsing/incident_reporting/resource_request_detector_unittest.cc',
       'browser/safe_browsing/incident_reporting/state_store_unittest.cc',
       'browser/safe_browsing/incident_reporting/tracked_preference_incident_unittest.cc',
       'browser/safe_browsing/incident_reporting/variations_seed_signature_incident_unittest.cc',
       'browser/safe_browsing/local_database_manager_unittest.cc',
       'browser/safe_browsing/local_two_phase_testserver.cc',
       'browser/safe_browsing/path_sanitizer_unittest.cc',
+      'browser/safe_browsing/prefix_set_unittest.cc',
       'browser/safe_browsing/protocol_manager_unittest.cc',
       'browser/safe_browsing/protocol_parser_unittest.cc',
       'browser/safe_browsing/safe_browsing_database_unittest.cc',
       'browser/safe_browsing/safe_browsing_store_file_unittest.cc',
       'browser/safe_browsing/safe_browsing_store_unittest.cc',
       'browser/safe_browsing/safe_browsing_util_unittest.cc',
       'browser/safe_browsing/sandboxed_dmg_analyzer_mac_unittest.cc',
       'browser/safe_browsing/sandboxed_zip_analyzer_unittest.cc',
       'browser/safe_browsing/test_database_manager.cc',
       'browser/safe_browsing/test_database_manager.h',
@@ skipping 1966 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }