Refactor the resource_prefetch_predictor.

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index be7d4db8c8c263a6bf120a4766ad32b28907cc51..e182dde5794b1f69695824d85e1f3c9da8eb5816 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -1559,8 +1559,8 @@ test("browser_tests") {
       "../browser/interstitials/security_interstitial_page_test_utils.h",
       "../browser/invalidation/profile_invalidation_provider_factory_browsertest.cc",
       "../browser/lifetime/browser_close_manager_browsertest.cc",
-      "../browser/loadtimes_extension_bindings_browsertest.cc",
       "../browser/loader/chrome_resource_dispatcher_host_delegate_browsertest.cc",
+      "../browser/loadtimes_extension_bindings_browsertest.cc",
       "../browser/locale_tests_browsertest.cc",
       "../browser/media/defer_background_media_browsertest.cc",
       "../browser/media/encrypted_media_browsertest.cc",
@@ -3178,6 +3178,8 @@ test("unit_tests") {
     "../browser/predictors/autocomplete_action_predictor_unittest.cc",
     "../browser/predictors/resource_prefetch_common_unittest.cc",
     "../browser/predictors/resource_prefetch_predictor_tables_unittest.cc",
+    "../browser/predictors/resource_prefetch_predictor_test_util.cc",
+    "../browser/predictors/resource_prefetch_predictor_test_util.h",
     "../browser/predictors/resource_prefetch_predictor_unittest.cc",
     "../browser/predictors/resource_prefetcher_unittest.cc",
     "../browser/prefs/chrome_pref_service_unittest.cc",