Move prefix_set and parts of safe_browsing_util into a new component safe_browsing_db.

components/components.gyp

 # Copyright (c) 2013 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': {
     # This turns on e.g. the filename-based detection of which
     # platforms to include source files on (e.g. files ending in
     # _mac.h or _mac.cc are only compiled on MacOSX).
     'chromium_code': 1,
@@ skipping 102 matching lines @@
         'cdm.gypi',
         'certificate_transparency.gypi',
         'devtools_discovery.gypi',
         'devtools_http_handler.gypi',
         'drive.gypi',
         'message_port.gypi',
         'navigation_interception.gypi',
         'packed_ct_ev_whitelist.gypi',
         'page_load_metrics.gypi',
         'power.gypi',
+        'safe_browsing_db.gypi',
         'safe_json.gypi',
         'visitedlink.gypi',
         'wallpaper.gypi',
         'web_cache.gypi',
         'web_contents_delegate_android.gypi',
         'web_modal.gypi',
       ],
     }],
     ['OS == "ios"', {
       'includes': [
@@ skipping 55 matching lines @@
         'chrome_apps.gypi',
       ],
     }],
     ['enable_rlz_support==1', {
       'includes': [
         'rlz.gypi',
       ],
     }]
   ],
 }