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

chrome/test/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/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/chrome_tests.gni")
@@ skipping 1550 matching lines @@
 
     if (!is_ios) {
       deps += [
         ":unit_tests_js",
         "//components/audio_modem:test_support",
         "//components/autofill/content/browser/wallet:test_support",
         "//components/autofill/content/renderer:test_support",
         "//components/data_reduction_proxy/core/browser:test_support",
         "//components/data_use_measurement/core",
         "//components/metrics/proto",
+        "//components/safe_browsing_db",
         "//components/safe_json:test_support",
         "//components/webdata_services:test_support",
         "//components/strings",
         "//device/bluetooth:mocks",
         "//content/app/resources",
         "//gpu:test_support",
         "//media:test_support",
 
         #'../ppapi/ppapi_internal.gyp:ppapi_unittest_shared',  TODO(GYP)
         "//third_party/leveldatabase",
@@ skipping 568 matching lines @@
     "//third_party/mojo/src/mojo/edk/system",
   ]
 
   if (!is_android && use_ash) {
     sources += rebase_path(
             chrome_tests_unit_gypi_values.chrome_test_support_unit_ash_sources,
             ".",
             "//chrome")
   }
 }