[WIP][DO NOT LAND] Componentize spellcheck

chrome/browser/spellchecker/spellcheck_custom_dictionary.h

Index: chrome/browser/spellchecker/spellcheck_custom_dictionary.h
diff --git a/chrome/browser/spellchecker/spellcheck_custom_dictionary.h b/chrome/browser/spellchecker/spellcheck_custom_dictionary.h
index 065f2c3973da20f8516236c5b8c68ac173783a47..8b8457b52bdf39be24ecd4294491f4202950b463 100644
--- a/chrome/browser/spellchecker/spellcheck_custom_dictionary.h
+++ b/chrome/browser/spellchecker/spellcheck_custom_dictionary.h
@@ -14,7 +14,7 @@
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
-#include "chrome/browser/spellchecker/spellcheck_dictionary.h"
+#include "components/spellcheck/browser/spellcheck_dictionary.h"
 #include "sync/api/sync_data.h"
 #include "sync/api/sync_error.h"
 #include "sync/api/sync_merge_result.h"
@@ -41,6 +41,8 @@ class Location;
 class SpellcheckCustomDictionary : public SpellcheckDictionary,
                                    public syncer::SyncableService {
  public:
+  static const base::FilePath::CharType kCustomDictionaryFileName[];
+
   // A change to the dictionary.
   class Change {
    public: