Use the previews black list for offline previews

components/previews/core/BUILD.gn

Index: components/previews/core/BUILD.gn
diff --git a/components/previews/core/BUILD.gn b/components/previews/core/BUILD.gn
index ab80cb825ad91a3b7cf56d9f40da3eb6f326842d..7bf8b5eca773430a4166cf7f1a8f8badeb9fec53 100644
--- a/components/previews/core/BUILD.gn
+++ b/components/previews/core/BUILD.gn
@@ -3,33 +3,35 @@
 # found in the LICENSE file.
 
 static_library("core") {
   sources = [
     "previews_black_list.cc",
     "previews_black_list.h",
     "previews_black_list_item.cc",
     "previews_black_list_item.h",
     "previews_data_savings.cc",
     "previews_data_savings.h",
+    "previews_decider.h",
     "previews_experiments.cc",
     "previews_experiments.h",
     "previews_io_data.cc",
     "previews_io_data.h",
     "previews_opt_out_store.h",
     "previews_ui_service.cc",
     "previews_ui_service.h",
   ]
 
   deps = [
     "//base",
     "//components/data_reduction_proxy/core/common",
     "//components/variations",
+    "//net",
     "//url:url",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "previews_black_list_item_unittest.cc",
     "previews_black_list_unittest.cc",
     "previews_data_savings_unittest.cc",