Create chrome/browser/offline_pages to host browser-related parts of offline_pages whcih

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index bf646f6fb80d283d86b85ace2c1c8cb4d14fb91c..f72b730661adb9597f696f5b64bf641ac3b43f7d 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -2113,8 +2113,6 @@ split_static_library("browser") {
 
   if (enable_offline_pages) {
     sources += [
-      "android/offline_pages/background_loader_offliner.cc",
-      "android/offline_pages/background_loader_offliner.h",
       "android/offline_pages/background_scheduler_bridge.cc",
       "android/offline_pages/background_scheduler_bridge.h",
       "android/offline_pages/downloads/offline_page_download_bridge.cc",
@@ -2157,6 +2155,8 @@ split_static_library("browser") {
       "android/offline_pages/recent_tab_helper.h",
       "android/offline_pages/request_coordinator_factory.cc",
       "android/offline_pages/request_coordinator_factory.h",
+      "offline_pages/background_loader_offliner.cc",
+      "offline_pages/background_loader_offliner.h",
     ]
     deps += [
       "//components/offline_pages/content",