Unrevert r141537: Add extensions::StateStore and use that instead of

chrome/browser/extensions/extension_prefs.h

Index: chrome/browser/extensions/extension_prefs.h
diff --git a/chrome/browser/extensions/extension_prefs.h b/chrome/browser/extensions/extension_prefs.h
index 37607bfe5e01f14efdaa14162ba5a37a5048c980..e6e3cee00ee8e718aa891fd3a5b101f716c48e3e 100644
--- a/chrome/browser/extensions/extension_prefs.h
+++ b/chrome/browser/extensions/extension_prefs.h
@@ -28,7 +28,6 @@ class PrefService;
 class URLPatternSet;
 
 namespace extensions {
-struct AlarmPref;
 struct ExtensionOmniboxSuggestion;
 }
 
@@ -276,13 +275,6 @@ class ExtensionPrefs : public extensions::ContentSettingsStore::Observer,
   void SetRegisteredEvents(const std::string& extension_id,
                            const std::set<std::string>& events);
 
-  // Controls a list of alarms for this extension, including the next time they
-  // should run.
-  std::vector<extensions::AlarmPref> GetRegisteredAlarms(
-      const std::string& extension_id);
-  void SetRegisteredAlarms(const std::string& extension_id,
-                           const std::vector<extensions::AlarmPref>& alarms);
-
   // Controls the omnibox default suggestion as set by the extension.
   extensions::ExtensionOmniboxSuggestion GetOmniboxDefaultSuggestion(
       const std::string& extension_id);