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

components/offline_pages/core/downloads/BUILD.gn

Index: components/offline_pages/core/downloads/BUILD.gn
diff --git a/components/offline_pages/downloads/BUILD.gn b/components/offline_pages/core/downloads/BUILD.gn
similarity index 75%
rename from components/offline_pages/downloads/BUILD.gn
rename to components/offline_pages/core/downloads/BUILD.gn
index 41f709f7d93015e9cd5923bca535f0a418a3abf6..ad8ea055b78974aec766b52b9c628a76e3dead5b 100644
--- a/components/offline_pages/downloads/BUILD.gn
+++ b/components/offline_pages/core/downloads/BUILD.gn
@@ -19,8 +19,8 @@ static_library("offline_pages_ui_adapter") {
 
   deps = [
     "//base",
-    "//components/offline_pages:offline_pages",
-    "//components/offline_pages/background:background_offliner",
+    "//components/offline_pages/core",
+    "//components/offline_pages/core/background:background_offliner",
     "//url",
   ]
 }
@@ -36,9 +36,9 @@ source_set("unit_tests") {
     ":offline_pages_ui_adapter",
     "//base",
     "//base/test:test_support",
-    "//components/offline_pages:offline_pages",
-    "//components/offline_pages:test_support",
-    "//components/offline_pages/background:background_offliner",
+    "//components/offline_pages/core",
+    "//components/offline_pages/core:test_support",
+    "//components/offline_pages/core/background:background_offliner",
     "//testing/gtest",
   ]
 }