Componentize invalidator storage + preferences

components/invalidation/invalidation_prefs.h

Index: components/invalidation/invalidation_prefs.h
diff --git a/components/translate/core/common/translate_pref_names.cc b/components/invalidation/invalidation_prefs.h
similarity index 51%
copy from components/translate/core/common/translate_pref_names.cc
copy to components/invalidation/invalidation_prefs.h
index 883f37e559bab7857f9aece6f33852139c67e12b..2fdc5f230e504c02bb95b26474762285a36ed4a0 100644
--- a/components/translate/core/common/translate_pref_names.cc
+++ b/components/invalidation/invalidation_prefs.h
@@ -2,11 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/translate/core/common/translate_pref_names.h"
-
+namespace invalidation {
 namespace prefs {
 
-// Boolean that is true when the translate feature is enabled.
-const char kEnableTranslate[] = "translate.enabled";
+extern const char kInvalidatorClientId[];
+
+extern const char kInvalidatorInvalidationState[];
+
+extern const char kInvalidatorSavedInvalidations[];
 
 }  // namespace prefs
+}  // namespace invalidation