Delete deprecated synced notifications code

sync/internal_api/public/base/model_type.h

Index: sync/internal_api/public/base/model_type.h
diff --git a/sync/internal_api/public/base/model_type.h b/sync/internal_api/public/base/model_type.h
index 716bece7ec22a63754c0bbd32774794d1e0ef13e..f9a8c1403a38cb168284fec51f655841e6e42a87 100644
--- a/sync/internal_api/public/base/model_type.h
+++ b/sync/internal_api/public/base/model_type.h
@@ -80,13 +80,13 @@ enum ModelType {
   // An extension setting from the extension settings API.
   EXTENSION_SETTINGS,
   // App notifications.
-  APP_NOTIFICATIONS,
+  APP_NOTIFICATIONS,  // Deprecated.

[Pete Williamson, 2014/12/10 22:10:05]

You know that this is not related to synced notifications, right?  It is OK if
you are deprecating it as part of cleanup, but does not strictly need to be
removed for synced notifications.

[Nicolas Zea, 2014/12/10 22:26:02]

Yeah, this is an old datatype that is no longer being used, so figured I'd
update it too.

   // History delete directives.
   HISTORY_DELETE_DIRECTIVES,
   // Synced push notifications.
-  SYNCED_NOTIFICATIONS,
+  SYNCED_NOTIFICATIONS,   // Deprecated.
   // Synced Notification app info.
-  SYNCED_NOTIFICATION_APP_INFO,
+  SYNCED_NOTIFICATION_APP_INFO,  // Deprecated.
   // Custom spelling dictionary.
   DICTIONARY,
   // Favicon images.