[Sync] Add history delete directive type

sync/internal_api/sync_encryption_handler_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sync/internal_api/sync_encryption_handler_impl.h"
 
 #include <queue>
 #include <string>
 
 #include "base/base64.h"
@@ skipping 79 matching lines @@
     case IMPLICIT_PASSPHRASE:
       return sync_pb::NigoriSpecifics::IMPLICIT_PASSPHRASE;
     case KEYSTORE_PASSPHRASE:
       return sync_pb::NigoriSpecifics::KEYSTORE_PASSPHRASE;
     case CUSTOM_PASSPHRASE:
       return sync_pb::NigoriSpecifics::CUSTOM_PASSPHRASE;
     case FROZEN_IMPLICIT_PASSPHRASE:
       return sync_pb::NigoriSpecifics::FROZEN_IMPLICIT_PASSPHRASE;
     default:
       NOTREACHED();
-      return sync_pb::NigoriSpecifics::IMPLICIT_PASSPHRASE;;
+      return sync_pb::NigoriSpecifics::IMPLICIT_PASSPHRASE;
   };
 }
 
 bool IsExplicitPassphrase(PassphraseType type) {
   return type == CUSTOM_PASSPHRASE || type == FROZEN_IMPLICIT_PASSPHRASE;
 }
 
 }  // namespace
 
 SyncEncryptionHandlerImpl::Vault::Vault(
@@ skipping 1237 matching lines @@
 
 base::Time SyncEncryptionHandlerImpl::GetExplicitPassphraseTime() const {
   if (passphrase_type_ == FROZEN_IMPLICIT_PASSPHRASE)
     return migration_time();
   else if (passphrase_type_ == CUSTOM_PASSPHRASE)
     return custom_passphrase_time();
   return base::Time();
 }
 
 }  // namespace browser_sync