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

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index 6b3d5d594e0ee6774a4fe6954bcf5d46dd9afd5b..fa0d94719804a0c534100c27988afb1e274f99c6 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -152,7 +152,7 @@ static_library("test_support") {
       "//components/guest_view/browser:test_support",
       "//components/infobars/core",
       "//components/network_time:network_time_test_support",
-      "//components/offline_pages:test_support",
+      "//components/offline_pages/core:test_support",
       "//components/sessions:test_support",
       "//components/web_resource:test_support",
       "//content/public/child",
@@ -3529,8 +3529,8 @@ test("unit_tests") {
       ":unit_tests_java",
       "//components/gcm_driver/instance_id/android:instance_id_driver_java",
       "//components/gcm_driver/instance_id/android:instance_id_driver_test_support_java",
-      "//components/offline_pages:test_support",
-      "//components/offline_pages/background:test_support",
+      "//components/offline_pages/core:test_support",
+      "//components/offline_pages/core/background:test_support",
       "//v8:v8_external_startup_data_assets",
     ]
     deps -= [ "//third_party/libaddressinput" ]