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

components/safe_browsing_db.gypi

-# Copyright 2014 The Chromium Authors. All rights reserved.
+# 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/packed_ct_ev_whitelist
-      'target_name': 'packed_ct_ev_whitelist',
+      # GN version: //components/safe_browsing_db
+      'target_name': 'safe_browsing_db',
       'type': 'static_library',
+      'dependencies': [
+        '../base/base.gyp:base',
+        '../crypto/crypto.gyp:crypto',
+      ],
+      'sources': [
+        # Note: sources list duplicated in GN build.
+        'safe_browsing_db/prefix_set.h',
+        'safe_browsing_db/prefix_set.cc',
+        'safe_browsing_db/safe_browsing_db_util.h',
+        'safe_browsing_db/safe_browsing_db_util.cc',
+      ],
       'include_dirs': [
         '..',
       ],
-      'dependencies': [
-        '../base/base.gyp:base',
-        '../content/content.gyp:content_common',
-        '../net/net.gyp:net',
-      ],
-      'sources': [
-        # Note: sources list duplicated in GN build.
-        'packed_ct_ev_whitelist/bit_stream_reader.cc',
-        'packed_ct_ev_whitelist/bit_stream_reader.h',
-        'packed_ct_ev_whitelist/packed_ct_ev_whitelist.cc',
-        'packed_ct_ev_whitelist/packed_ct_ev_whitelist.h',
-      ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [4267, ],
     },
   ],
 }