Move ReadingList model to components/reading_list/core

ios/chrome/browser/reading_list/BUILD.gn

Index: ios/chrome/browser/reading_list/BUILD.gn
diff --git a/ios/chrome/browser/reading_list/BUILD.gn b/ios/chrome/browser/reading_list/BUILD.gn
index c4b116bf07aee92133de26a954f9827105d794a0..85b25b8866a0f47d081b61edd96430dbb5fb1656 100644
--- a/ios/chrome/browser/reading_list/BUILD.gn
+++ b/ios/chrome/browser/reading_list/BUILD.gn
@@ -37,6 +37,7 @@ source_set("reading_list") {
     "//components/pref_registry",
     "//components/prefs",
     "//components/reading_list/core",
+    "//components/reading_list/core:flags",
     "//components/reading_list/ios",
     "//components/sync",
     "//ios/chrome/browser",
@@ -63,7 +64,7 @@ source_set("reading_list_remover") {
   ]
   deps = [
     "//base",
-    "//components/reading_list/ios",
+    "//components/reading_list/core",
     "//ios/chrome/browser/browser_state",
   ]
 }