sync: Remove ClearUserData command.

sync/internal_api/debug_info_event_listener.cc

Index: sync/internal_api/debug_info_event_listener.cc
diff --git a/sync/internal_api/debug_info_event_listener.cc b/sync/internal_api/debug_info_event_listener.cc
index 6b3cd23415d89210e367c988e62943e896a27e1e..022bac386242bb26a902d8a150556b472eee5994 100644
--- a/sync/internal_api/debug_info_event_listener.cc
+++ b/sync/internal_api/debug_info_event_listener.cc
@@ -77,16 +77,6 @@ void DebugInfoEventListener::OnUpdatedToken(const std::string& token) {
   CreateAndAddEvent(sync_pb::DebugEventInfo::UPDATED_TOKEN);
 }
 
-void DebugInfoEventListener::OnClearServerDataFailed() {
-  // This command is not implemented on the client side.
-  NOTREACHED();
-}
-
-void DebugInfoEventListener::OnClearServerDataSucceeded() {
-  // This command is not implemented on the client side.
-  NOTREACHED();
-}
-
 void DebugInfoEventListener::OnEncryptedTypesChanged(
     syncable::ModelTypeSet encrypted_types,
     bool encrypt_everything) {