Enable RL sync by default on iOS

components/reading_list/ios/reading_list_pref_names.h

Index: components/reading_list/ios/reading_list_pref_names.h
diff --git a/components/reading_list/reading_list_pref_names.h b/components/reading_list/ios/reading_list_pref_names.h
similarity index 66%
rename from components/reading_list/reading_list_pref_names.h
rename to components/reading_list/ios/reading_list_pref_names.h
index b5c82afd7322e56a56babfbc907aadd212fc7c41..c9afb6013b51f7982af8d90091fdfae97f0d2bb9 100644
--- a/components/reading_list/reading_list_pref_names.h
+++ b/components/reading_list/ios/reading_list_pref_names.h
@@ -4,8 +4,8 @@
 
 // Constants for the names of various reading list preferences.
 
-#ifndef COMPONENTS_READING_LIST_READING_LIST_PREF_NAMES_H_
-#define COMPONENTS_READING_LIST_READING_LIST_PREF_NAMES_H_
+#ifndef COMPONENTS_READING_LIST_IOS_READING_LIST_PREF_NAMES_H_
+#define COMPONENTS_READING_LIST_IOS_READING_LIST_PREF_NAMES_H_
 
 namespace reading_list {
 namespace prefs {
@@ -15,4 +15,4 @@ extern const char kReadingListHasUnseenEntries[];
 }  // namespace prefs
 }  // namespace reading_list
 
-#endif  // COMPONENTS_READING_LIST_READING_LIST_PREF_NAMES_H_
+#endif  // COMPONENTS_READING_LIST_IOS_READING_LIST_PREF_NAMES_H_