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 92%
rename from components/offline_pages/background/BUILD.gn
rename to components/offline_pages/core/background/BUILD.gn
index 3f428f15a9c521e0c4cf340f0e5719945c0ec0a4..afdeb4fbcdaf369620a7bdbdebe4f4d994143d11 100644
--- a/components/offline_pages/background/BUILD.gn
+++ b/components/offline_pages/core/background/BUILD.gn
@@ -49,9 +49,8 @@ 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",
@@ -78,8 +77,8 @@ source_set("unit_tests") {
     ":background_offliner",
     "//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",
   ]