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

chrome/browser/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//third_party/protobuf/proto_library.gni")
 
@@ skipping 280 matching lines @@
       "//components/history/content/browser",
       "//components/keyed_service/content",
       "//components/navigation_interception",
       "//components/net_log",
       "//components/network_hints/common",
       "//components/password_manager/content/browser",
       "//components/password_manager/sync/browser",
       "//components/plugins/common",
       "//components/proxy_config",
       "//components/resources",
+      "//components/safe_browsing_db",
       "//components/safe_json",
       "//components/sessions",
       "//components/ssl_config",
       "//components/storage_monitor",
       "//components/syncable_prefs",
       "//components/translate/content/browser",
       "//components/upload_list",
       "//components/url_matcher",
       "//components/visitedlink/browser",
       "//components/visitedlink/common",
@@ skipping 943 matching lines @@
         rebase_path(gypi_values.chrome_browser_rlz_sources, ".", "//chrome")
     deps = [
       "//components/google/core/browser",
       "//components/omnibox/browser",
       "//components/rlz",
       "//components/search_engines",
       "//rlz:rlz_lib",
     ]
   }
 }