Move all components/offline_pages/ files into component/offline_pages/core

components/offline_pages/core/background/BUILD.gn

Index: components/offline_pages/core/background/BUILD.gn
diff --git a/components/offline_pages/background/BUILD.gn b/components/offline_pages/core/background/BUILD.gn
similarity index 94%
rename from components/offline_pages/background/BUILD.gn
rename to components/offline_pages/core/background/BUILD.gn
index fd5ab2f096a5f332d84a037c32cfc1236adfd907..0c79a3be9f12f1669c601a837557c346f22a685a 100644
--- a/components/offline_pages/background/BUILD.gn
+++ b/components/offline_pages/core/background/BUILD.gn
@@ -59,9 +59,8 @@ static_library("background_offliner") {
   deps = [
     "//base",
     "//components/keyed_service/core",
-    "//components/offline_pages:offline_pages",
-    "//components/offline_pages:switches",
     "//components/offline_pages/core",
+    "//components/offline_pages/core:switches",
     "//net",
     "//sql:sql",
     "//url",
@@ -115,8 +114,8 @@ source_set("unit_tests") {
     ":test_support",
     "//base",
     "//base/test:test_support",
-    "//components/offline_pages:offline_pages",
-    "//components/offline_pages:switches",
+    "//components/offline_pages/core",
+    "//components/offline_pages/core:switches",
     "//testing/gtest",
     "//url",
   ]